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Interactions between Somatropin and Suphedrin Plus

1 drug interaction and 39 additional warnings found for the following 2 drugs:

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Drug interactions

Moderate drug interactions

Moderate:

acetaminophen somatropin

Applies to: Suphedrin Plus (acetaminophen / pseudoephedrine) and somatropin
Monitor

Coadministration with human growth hormone (hGH) receptor agonists may alter the clearance and plasma concentrations of medicinal products that are metabolized by CYP450 isoenzymes. The mechanism of this interaction may be mediated via the effects of hGH receptor agonists on expression of different CYP450 isoenzymes. The labeling of some hGH receptor agonists specify that this interaction may be the most significant for substrates of CYP450 3A4 and/or 1A2 and indicate that their clearance may be increased. However, clinical data are limited, and clinical significance is unknown. In a study of 11 growth hormone (GH)-deficient adults randomized to GH or placebo for 6 months followed by 3 months of GH for all subjects, antipyrine clearance, a non-specific marker of hepatic CYP450 activity, increased in all subjects who received GH treatment compared to placebo. In vitro studies have indicated that GH enhanced CYP450 3A4 gene expression; however, other studies have suggested that when administered in a pulsatile fashion, CYP450 3A4 activity is reduced. A study in healthy elderly men did not reveal any effects on CYP450 3A4 or 2D6 but did demonstrate induction of 1A2 and inhibition of 2C19. Given that studies have varied in the type of growth hormone used, dosing regimens, ages and sexes of the patients and/or cell lines utilized, it is difficult to predict how coadministration may affect the CYP450 substrate.

Management

Careful monitoring is advised when drugs that are metabolized by CYP450 isoenzymes are used in combination with hGH receptor agonists. As this interaction's clinical significance is unknown, the label of the specific hGH receptor agonist and CYP450 substrate(s) being coadministered should be consulted for more specific guidance.

References (20)
  1. (2003) "Product Information. Humatrope (somatropin)." Lilly, Eli and Company
  2. (2004) "Product Information. Zorbtive (somatropin)." Serono Laboratories Inc
  3. (2025) "Product Information. Skytrofa (lonapegsomatropin)." Ascendis Pharma, Inc., DailyMed
  4. (2025) "Product Information. Norditropin (somatropin)." Novo Nordisk Pharmaceuticals Inc
  5. (2024) "Product Information. Norditropin FlexPro (somatropin)." Novo Nordisk Ltd
  6. (2020) "Product Information. Genotropin Miniquick (somatropin)." Pfizer Canada ULC
  7. (2025) "Product Information. Ngenla (somatrogon)." Pfizer U.S. Pharmaceuticals Group
  8. (2025) "Product Information. Ngenla (somatrogon)." Pfizer Canada ULC
  9. (2026) "Product Information. Ngenla (somatrogon)." Pfizer Australia Pty Ltd
  10. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Pharmaceuticals Pty Ltd
  11. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Pharmaceuticals Inc
  12. (2023) "Product Information. Sogroya (somapacitan)." Novo Nordisk Canada Inc
  13. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Ltd, 2
  14. (2026) "Product Information. Ngenla (somatrogon)." Pfizer Ltd
  15. Cheung NW, Liddle C, Coverdale S, Lou JC, boyages sc (1996) "Growth hormone treatment increases cytochrome P450-mediated antipyrine clearance in man" The Journal of Clinical Endocrinology & Metabolism, 81, p. 1996-2001
  16. Dhir RN, Dworakowski W, Thangavel C, Shapiro BH (2006) "Sexually dimorphic regulation of hepatic isoforms of human cytochrome P450 by growth hormone" The Journal of Pharmacology and Experimental Therapeutics, 316, p. 87-94
  17. Jurgens G, Lange KHW, Reuther LO, et al (2002) "Effect of growth hormone on hepatic cytochrome P450 activity in healthy elderly men" Clin Pharmacol and Therapeutic, 71, p. 162-8
  18. jaffe ca, turgeon dk, Demott-Friberg R, Watkins PB (2002) "Growth hormone secretion pattern is an independent regulator of growth hormone actions in humans" American Journal of Physiology-Endocrinology and Metabolism, 283, E1008-E1015
  19. (2025) "Product Information. Saizen (somatropin)." Merck Serono Australia Pty Ltd, A015-0925
  20. (2025) "Product Information. Skytrofa (lonapegsomatropin)." Specialised Therapeutics Pharma Pty Ltd

Food/lifestyle interactions

Major food/lifestyle interactions

Major:

acetaminophen Food/Lifestyle

Applies to: Suphedrin Plus (acetaminophen / pseudoephedrine)
Generally avoid

Chronic, excessive consumption of alcohol may increase the risk of acetaminophen-induced hepatotoxicity, which has included rare cases of fatal hepatitis and frank hepatic failure requiring liver transplantation. The proposed mechanism is induction of hepatic microsomal enzymes during chronic alcohol use, which may result in accelerated metabolism of acetaminophen and increased production of potentially hepatotoxic metabolites.

Management

In general, chronic alcoholics should avoid regular or excessive use of acetaminophen. Alternative analgesic/antipyretic therapy may be appropriate in patients who consume three or more alcoholic drinks per day.

References (1)
  1. (2022) "Product Information. Acetaminophen (acetaminophen)." Camber Pharmaceuticals, Inc

Moderate food/lifestyle interactions

Moderate:

somatropin Alcohol (Ethanol)

Applies to: somatropin
Monitor

Coadministration with human growth hormone (hGH) receptor agonists may alter the clearance and plasma concentrations of medicinal products that are metabolized by CYP450 isoenzymes. The mechanism of this interaction may be mediated via the effects of hGH receptor agonists on expression of different CYP450 isoenzymes. The labeling of some hGH receptor agonists specify that this interaction may be the most significant for substrates of CYP450 3A4 and/or 1A2 and indicate that their clearance may be increased. However, clinical data are limited, and clinical significance is unknown. In a study of 11 growth hormone (GH)-deficient adults randomized to GH or placebo for 6 months followed by 3 months of GH for all subjects, antipyrine clearance, a non-specific marker of hepatic CYP450 activity, increased in all subjects who received GH treatment compared to placebo. In vitro studies have indicated that GH enhanced CYP450 3A4 gene expression; however, other studies have suggested that when administered in a pulsatile fashion, CYP450 3A4 activity is reduced. A study in healthy elderly men did not reveal any effects on CYP450 3A4 or 2D6 but did demonstrate induction of 1A2 and inhibition of 2C19. Given that studies have varied in the type of growth hormone used, dosing regimens, ages and sexes of the patients and/or cell lines utilized, it is difficult to predict how coadministration may affect the CYP450 substrate.

Management

Careful monitoring is advised when drugs that are metabolized by CYP450 isoenzymes are used in combination with hGH receptor agonists. As this interaction's clinical significance is unknown, the label of the specific hGH receptor agonist and CYP450 substrate(s) being coadministered should be consulted for more specific guidance.

References (20)
  1. (2003) "Product Information. Humatrope (somatropin)." Lilly, Eli and Company
  2. (2004) "Product Information. Zorbtive (somatropin)." Serono Laboratories Inc
  3. (2025) "Product Information. Skytrofa (lonapegsomatropin)." Ascendis Pharma, Inc., DailyMed
  4. (2025) "Product Information. Norditropin (somatropin)." Novo Nordisk Pharmaceuticals Inc
  5. (2024) "Product Information. Norditropin FlexPro (somatropin)." Novo Nordisk Ltd
  6. (2020) "Product Information. Genotropin Miniquick (somatropin)." Pfizer Canada ULC
  7. (2025) "Product Information. Ngenla (somatrogon)." Pfizer U.S. Pharmaceuticals Group
  8. (2025) "Product Information. Ngenla (somatrogon)." Pfizer Canada ULC
  9. (2026) "Product Information. Ngenla (somatrogon)." Pfizer Australia Pty Ltd
  10. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Pharmaceuticals Pty Ltd
  11. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Pharmaceuticals Inc
  12. (2023) "Product Information. Sogroya (somapacitan)." Novo Nordisk Canada Inc
  13. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Ltd, 2
  14. (2026) "Product Information. Ngenla (somatrogon)." Pfizer Ltd
  15. Cheung NW, Liddle C, Coverdale S, Lou JC, boyages sc (1996) "Growth hormone treatment increases cytochrome P450-mediated antipyrine clearance in man" The Journal of Clinical Endocrinology & Metabolism, 81, p. 1996-2001
  16. Dhir RN, Dworakowski W, Thangavel C, Shapiro BH (2006) "Sexually dimorphic regulation of hepatic isoforms of human cytochrome P450 by growth hormone" The Journal of Pharmacology and Experimental Therapeutics, 316, p. 87-94
  17. Jurgens G, Lange KHW, Reuther LO, et al (2002) "Effect of growth hormone on hepatic cytochrome P450 activity in healthy elderly men" Clin Pharmacol and Therapeutic, 71, p. 162-8
  18. jaffe ca, turgeon dk, Demott-Friberg R, Watkins PB (2002) "Growth hormone secretion pattern is an independent regulator of growth hormone actions in humans" American Journal of Physiology-Endocrinology and Metabolism, 283, E1008-E1015
  19. (2025) "Product Information. Saizen (somatropin)." Merck Serono Australia Pty Ltd, A015-0925
  20. (2025) "Product Information. Skytrofa (lonapegsomatropin)." Specialised Therapeutics Pharma Pty Ltd
Moderate:

somatropin Alcohol (Ethanol)

Applies to: somatropin
Monitor

Coadministration with human growth hormone (hGH) receptor agonists may alter the clearance and plasma concentrations of medicinal products that are metabolized by CYP450 isoenzymes. The mechanism of this interaction may be mediated via the effects of hGH receptor agonists on expression of different CYP450 isoenzymes. The labeling of some hGH receptor agonists specify that this interaction may be the most significant for substrates of CYP450 3A4 and/or 1A2 and indicate that their clearance may be increased. However, clinical data are limited, and clinical significance is unknown. In a study of 11 growth hormone (GH)-deficient adults randomized to GH or placebo for 6 months followed by 3 months of GH for all subjects, antipyrine clearance, a non-specific marker of hepatic CYP450 activity, increased in all subjects who received GH treatment compared to placebo. In vitro studies have indicated that GH enhanced CYP450 3A4 gene expression; however, other studies have suggested that when administered in a pulsatile fashion, CYP450 3A4 activity is reduced. A study in healthy elderly men did not reveal any effects on CYP450 3A4 or 2D6 but did demonstrate induction of 1A2 and inhibition of 2C19. Given that studies have varied in the type of growth hormone used, dosing regimens, ages and sexes of the patients and/or cell lines utilized, it is difficult to predict how coadministration may affect the CYP450 substrate.

Management

Careful monitoring is advised when drugs that are metabolized by CYP450 isoenzymes are used in combination with hGH receptor agonists. As this interaction's clinical significance is unknown, the label of the specific hGH receptor agonist and CYP450 substrate(s) being coadministered should be consulted for more specific guidance.

References (20)
  1. (2003) "Product Information. Humatrope (somatropin)." Lilly, Eli and Company
  2. (2004) "Product Information. Zorbtive (somatropin)." Serono Laboratories Inc
  3. (2025) "Product Information. Skytrofa (lonapegsomatropin)." Ascendis Pharma, Inc., DailyMed
  4. (2025) "Product Information. Norditropin (somatropin)." Novo Nordisk Pharmaceuticals Inc
  5. (2024) "Product Information. Norditropin FlexPro (somatropin)." Novo Nordisk Ltd
  6. (2020) "Product Information. Genotropin Miniquick (somatropin)." Pfizer Canada ULC
  7. (2025) "Product Information. Ngenla (somatrogon)." Pfizer U.S. Pharmaceuticals Group
  8. (2025) "Product Information. Ngenla (somatrogon)." Pfizer Canada ULC
  9. (2026) "Product Information. Ngenla (somatrogon)." Pfizer Australia Pty Ltd
  10. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Pharmaceuticals Pty Ltd
  11. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Pharmaceuticals Inc
  12. (2023) "Product Information. Sogroya (somapacitan)." Novo Nordisk Canada Inc
  13. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Ltd, 2
  14. (2026) "Product Information. Ngenla (somatrogon)." Pfizer Ltd
  15. Cheung NW, Liddle C, Coverdale S, Lou JC, boyages sc (1996) "Growth hormone treatment increases cytochrome P450-mediated antipyrine clearance in man" The Journal of Clinical Endocrinology & Metabolism, 81, p. 1996-2001
  16. Dhir RN, Dworakowski W, Thangavel C, Shapiro BH (2006) "Sexually dimorphic regulation of hepatic isoforms of human cytochrome P450 by growth hormone" The Journal of Pharmacology and Experimental Therapeutics, 316, p. 87-94
  17. Jurgens G, Lange KHW, Reuther LO, et al (2002) "Effect of growth hormone on hepatic cytochrome P450 activity in healthy elderly men" Clin Pharmacol and Therapeutic, 71, p. 162-8
  18. jaffe ca, turgeon dk, Demott-Friberg R, Watkins PB (2002) "Growth hormone secretion pattern is an independent regulator of growth hormone actions in humans" American Journal of Physiology-Endocrinology and Metabolism, 283, E1008-E1015
  19. (2025) "Product Information. Saizen (somatropin)." Merck Serono Australia Pty Ltd, A015-0925
  20. (2025) "Product Information. Skytrofa (lonapegsomatropin)." Specialised Therapeutics Pharma Pty Ltd
Moderate:

somatropin Caffeine

Applies to: somatropin
Monitor

Coadministration with human growth hormone (hGH) receptor agonists may alter the clearance and plasma concentrations of medicinal products that are metabolized by CYP450 isoenzymes. The mechanism of this interaction may be mediated via the effects of hGH receptor agonists on expression of different CYP450 isoenzymes. The labeling of some hGH receptor agonists specify that this interaction may be the most significant for substrates of CYP450 3A4 and/or 1A2 and indicate that their clearance may be increased. However, clinical data are limited, and clinical significance is unknown. In a study of 11 growth hormone (GH)-deficient adults randomized to GH or placebo for 6 months followed by 3 months of GH for all subjects, antipyrine clearance, a non-specific marker of hepatic CYP450 activity, increased in all subjects who received GH treatment compared to placebo. In vitro studies have indicated that GH enhanced CYP450 3A4 gene expression; however, other studies have suggested that when administered in a pulsatile fashion, CYP450 3A4 activity is reduced. A study in healthy elderly men did not reveal any effects on CYP450 3A4 or 2D6 but did demonstrate induction of 1A2 and inhibition of 2C19. Given that studies have varied in the type of growth hormone used, dosing regimens, ages and sexes of the patients and/or cell lines utilized, it is difficult to predict how coadministration may affect the CYP450 substrate.

Management

Careful monitoring is advised when drugs that are metabolized by CYP450 isoenzymes are used in combination with hGH receptor agonists. As this interaction's clinical significance is unknown, the label of the specific hGH receptor agonist and CYP450 substrate(s) being coadministered should be consulted for more specific guidance.

References (20)
  1. (2003) "Product Information. Humatrope (somatropin)." Lilly, Eli and Company
  2. (2004) "Product Information. Zorbtive (somatropin)." Serono Laboratories Inc
  3. (2025) "Product Information. Skytrofa (lonapegsomatropin)." Ascendis Pharma, Inc., DailyMed
  4. (2025) "Product Information. Norditropin (somatropin)." Novo Nordisk Pharmaceuticals Inc
  5. (2024) "Product Information. Norditropin FlexPro (somatropin)." Novo Nordisk Ltd
  6. (2020) "Product Information. Genotropin Miniquick (somatropin)." Pfizer Canada ULC
  7. (2025) "Product Information. Ngenla (somatrogon)." Pfizer U.S. Pharmaceuticals Group
  8. (2025) "Product Information. Ngenla (somatrogon)." Pfizer Canada ULC
  9. (2026) "Product Information. Ngenla (somatrogon)." Pfizer Australia Pty Ltd
  10. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Pharmaceuticals Pty Ltd
  11. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Pharmaceuticals Inc
  12. (2023) "Product Information. Sogroya (somapacitan)." Novo Nordisk Canada Inc
  13. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Ltd, 2
  14. (2026) "Product Information. Ngenla (somatrogon)." Pfizer Ltd
  15. Cheung NW, Liddle C, Coverdale S, Lou JC, boyages sc (1996) "Growth hormone treatment increases cytochrome P450-mediated antipyrine clearance in man" The Journal of Clinical Endocrinology & Metabolism, 81, p. 1996-2001
  16. Dhir RN, Dworakowski W, Thangavel C, Shapiro BH (2006) "Sexually dimorphic regulation of hepatic isoforms of human cytochrome P450 by growth hormone" The Journal of Pharmacology and Experimental Therapeutics, 316, p. 87-94
  17. Jurgens G, Lange KHW, Reuther LO, et al (2002) "Effect of growth hormone on hepatic cytochrome P450 activity in healthy elderly men" Clin Pharmacol and Therapeutic, 71, p. 162-8
  18. jaffe ca, turgeon dk, Demott-Friberg R, Watkins PB (2002) "Growth hormone secretion pattern is an independent regulator of growth hormone actions in humans" American Journal of Physiology-Endocrinology and Metabolism, 283, E1008-E1015
  19. (2025) "Product Information. Saizen (somatropin)." Merck Serono Australia Pty Ltd, A015-0925
  20. (2025) "Product Information. Skytrofa (lonapegsomatropin)." Specialised Therapeutics Pharma Pty Ltd
Moderate:

somatropin Caffeine

Applies to: somatropin
Monitor

Coadministration with human growth hormone (hGH) receptor agonists may alter the clearance and plasma concentrations of medicinal products that are metabolized by CYP450 isoenzymes. The mechanism of this interaction may be mediated via the effects of hGH receptor agonists on expression of different CYP450 isoenzymes. The labeling of some hGH receptor agonists specify that this interaction may be the most significant for substrates of CYP450 3A4 and/or 1A2 and indicate that their clearance may be increased. However, clinical data are limited, and clinical significance is unknown. In a study of 11 growth hormone (GH)-deficient adults randomized to GH or placebo for 6 months followed by 3 months of GH for all subjects, antipyrine clearance, a non-specific marker of hepatic CYP450 activity, increased in all subjects who received GH treatment compared to placebo. In vitro studies have indicated that GH enhanced CYP450 3A4 gene expression; however, other studies have suggested that when administered in a pulsatile fashion, CYP450 3A4 activity is reduced. A study in healthy elderly men did not reveal any effects on CYP450 3A4 or 2D6 but did demonstrate induction of 1A2 and inhibition of 2C19. Given that studies have varied in the type of growth hormone used, dosing regimens, ages and sexes of the patients and/or cell lines utilized, it is difficult to predict how coadministration may affect the CYP450 substrate.

Management

Careful monitoring is advised when drugs that are metabolized by CYP450 isoenzymes are used in combination with hGH receptor agonists. As this interaction's clinical significance is unknown, the label of the specific hGH receptor agonist and CYP450 substrate(s) being coadministered should be consulted for more specific guidance.

References (20)
  1. (2003) "Product Information. Humatrope (somatropin)." Lilly, Eli and Company
  2. (2004) "Product Information. Zorbtive (somatropin)." Serono Laboratories Inc
  3. (2025) "Product Information. Skytrofa (lonapegsomatropin)." Ascendis Pharma, Inc., DailyMed
  4. (2025) "Product Information. Norditropin (somatropin)." Novo Nordisk Pharmaceuticals Inc
  5. (2024) "Product Information. Norditropin FlexPro (somatropin)." Novo Nordisk Ltd
  6. (2020) "Product Information. Genotropin Miniquick (somatropin)." Pfizer Canada ULC
  7. (2025) "Product Information. Ngenla (somatrogon)." Pfizer U.S. Pharmaceuticals Group
  8. (2025) "Product Information. Ngenla (somatrogon)." Pfizer Canada ULC
  9. (2026) "Product Information. Ngenla (somatrogon)." Pfizer Australia Pty Ltd
  10. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Pharmaceuticals Pty Ltd
  11. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Pharmaceuticals Inc
  12. (2023) "Product Information. Sogroya (somapacitan)." Novo Nordisk Canada Inc
  13. (2025) "Product Information. Sogroya (somapacitan)." Novo Nordisk Ltd, 2
  14. (2026) "Product Information. Ngenla (somatrogon)." Pfizer Ltd
  15. Cheung NW, Liddle C, Coverdale S, Lou JC, boyages sc (1996) "Growth hormone treatment increases cytochrome P450-mediated antipyrine clearance in man" The Journal of Clinical Endocrinology & Metabolism, 81, p. 1996-2001
  16. Dhir RN, Dworakowski W, Thangavel C, Shapiro BH (2006) "Sexually dimorphic regulation of hepatic isoforms of human cytochrome P450 by growth hormone" The Journal of Pharmacology and Experimental Therapeutics, 316, p. 87-94
  17. Jurgens G, Lange KHW, Reuther LO, et al (2002) "Effect of growth hormone on hepatic cytochrome P450 activity in healthy elderly men" Clin Pharmacol and Therapeutic, 71, p. 162-8
  18. jaffe ca, turgeon dk, Demott-Friberg R, Watkins PB (2002) "Growth hormone secretion pattern is an independent regulator of growth hormone actions in humans" American Journal of Physiology-Endocrinology and Metabolism, 283, E1008-E1015
  19. (2025) "Product Information. Saizen (somatropin)." Merck Serono Australia Pty Ltd, A015-0925
  20. (2025) "Product Information. Skytrofa (lonapegsomatropin)." Specialised Therapeutics Pharma Pty Ltd
Moderate:

pseudoephedrine Caffeine

Applies to: Suphedrin Plus (acetaminophen / pseudoephedrine)
Monitor

Coadministration of two or more sympathomimetic or noradrenergic agents may increase the risk of nervousness, irritability, tachycardia, and/or increased blood pressure. Central nervous system (CNS) stimulants, particularly amphetamines, can potentiate the adrenergic response to vasopressors and other sympathomimetic and/or noradrenergic agents, including norepinephrine transporter inhibitors. Additive increases in blood pressure and heart rate may occur due to enhanced peripheral sympathetic activity.

Management

Caution is advised if two or more sympathomimetic or noradrenergic agents are coadministered. Pulse and blood pressure should be closely monitored. Consultation with individual product labeling, as well as relevant institutional protocols, may be advisable for further guidance.

References (20)
  1. Rosenblatt JE, Lake CR, van Kammen DP, Ziegler MG, Bunney WE Jr (1979) "Interactions of amphetamine, pimozide, and lithium on plasma norepineophrine and dopamine-beta-hydroxylase in schizophrenic patients." Psychiatry Res, 1, p. 45-52
  2. Cavanaugh JH, Griffith JD, Oates JA (1970) "Effect of amphetamine on the pressor response to tyramine: formation of p-hydroxynorephedrine from amphetamine in man." Clin Pharmacol Ther, 11, p. 656
  3. (2001) "Product Information. Adderall (amphetamine-dextroamphetamine)." Shire Richwood Pharmaceutical Company Inc
  4. (2001) "Product Information. Tenuate (diethylpropion)." Aventis Pharmaceuticals
  5. (2001) "Product Information. Sanorex (mazindol)." Novartis Pharmaceuticals
  6. (2001) "Product Information. Focalin (dexmethylphenidate)." Mikart Inc
  7. (2024) "Product Information. Ephedrine (ephedrine)." Hameln Pharma Ltd
  8. (2023) "Product Information. Ephedrine Hydrochloride (ephedrine)." Wockhardt UK Ltd
  9. (2026) "Product Information. Strattera (atomoxetine)." Lilly, Eli and Company
  10. (2025) "Product Information. Atomoxetine (atomoxetine)." Zentiva Pharma UK Ltd
  11. (2026) "Product Information. Atomoxetine (Apo) (atomoxetine)." Arrotex Pharmaceuticals Pty Ltd
  12. Angita Pharma, Inc (2026) AG-ATOMOXETINE Product Monograph (Health Canada) https://pdf.hres.ca/dpd_pm/00059014.PDF
  13. (2026) "Product Information. Boots Decongestant (Pseudoephedrine) (pseudoephedrine)." The Boots Company Plc
  14. (2023) "Product Information. Sinus and Nasal Decongestant (Trust) (pseudoephedrine)." Noumed Pharmaceuticals Pty Ltd
  15. (2019) "Product Information. Ephedrine (ephedrine)." Pfizer Australia Pty Ltd
  16. (2024) "Product Information. EPHEDrine Sulfate (ePHEDrine)." Amneal Pharmaceuticals LLC
  17. (2024) "Product Information. Lemsip Cough Max for Mucus Cough and Cold (guaifenesin/paracetamol/phenylephrine)." Reckitt Benckiser Healthcare (UK) Ltd
  18. emc (2026) Product information: sudafed plus blocked nose 1mg/50mg/ml nasal spray. https://www.medicines.org.uk/emc/product/14256/smpc?utm_source=chatgpt.com
  19. (2023) "Product Information. EPHEDrine Sulfate (ePHEDrine)." Baxter Corporation
  20. Neo Health (OTC) Pty Ltd (2026) Product information: pseudoephedrine hydrochloride-paracetamol capsules. https://www.ebs.tga.gov.au/ebs/picmi/picmirepository.nsf/pdf?OpenAgent&id=CP-2024-PI-02603-1&d=20260804172310101&d=20260827172310101

Disease interactions

33 potential interactions Applies to: 30 conditions, including Underactive Thyroid, Weight Loss, Benign Prostatic Hyperplasia, Breast Cancer, and Sleep Apnea.

Acute Abdomen

Major:

somatropin

Somatropin has a major potential interaction with Acute Abdomen.

Treatment with somatropin and somatrogon is contraindicated in patients with acute critical illness due to any complications following open heart surgery, abdominal surgery, multiple trauma, or acute respiratory failure. Patients with these conditions have an increased risk of mortality.

Alcoholism

Major:

Suphedrin Plus

The acetaminophen in Suphedrin Plus has a major potential interaction with Alcoholism.

Chronic alcohol abusers may be at increased risk of hepatotoxicity during treatment with acetaminophen (APAP). Severe liver injury, including cases of acute liver failure resulting in liver transplant and death, has been reported in patients using acetaminophen. Therapy with acetaminophen should be administered cautiously, if at all, in patients who consume three or more alcoholic drinks a day. In general, patients should avoid drinking alcohol while taking acetaminophen-containing medications. Patients should be warned not to exceed the maximum recommended total daily dosage of acetaminophen (4 g/day in adults and children 12 years of age or older), and to read all prescription and over-the-counter medication labels to ensure they are not taking multiple acetaminophen-containing products, or check with a healthcare professional if they are unsure. They should also be advised to seek medical attention if they experience signs and symptoms of liver injury such as fever, rash, anorexia, nausea, vomiting, fatigue, right upper quadrant pain, dark urine, and jaundice.

Benign Prostatic Hyperplasia

Moderate:

Suphedrin Plus

The pseudoephedrine in Suphedrin Plus has a moderate potential interaction with Benign Prostatic Hyperplasia.

Sympathomimetic agents may cause or worsen urinary difficulty in patients with prostate enlargement due to smooth muscle contraction in the bladder neck via stimulation of alpha-1 adrenergic receptors. Therapy with sympathomimetic agents should be administered cautiously in patients with hypertrophy or neoplasm of the prostate.

Bladder Cancer

Major:

somatropin

Somatropin has a major potential interaction with Bladder Cancer.

Somatropin and somatrogon are contraindicated in the presence of any active malignancy. Any preexistent malignancy should be inactive and its treatment should be completed prior to somatropin therapy. This includes the presence of any intracranial tumor. Somatropin and somatrogon should be discontinued if there is any evidence of recurrence.

Brain Tumor

Major:

somatropin

Somatropin has a major potential interaction with Brain Tumor.

Somatropin and somatrogon are contraindicated in the presence of any active malignancy. Any preexistent malignancy should be inactive and its treatment should be completed prior to somatropin therapy. This includes the presence of any intracranial tumor. Somatropin and somatrogon should be discontinued if there is any evidence of recurrence.

Breast Cancer

Major:

somatropin

Somatropin has a major potential interaction with Breast Cancer.

Somatropin and somatrogon are contraindicated in the presence of any active malignancy. Any preexistent malignancy should be inactive and its treatment should be completed prior to somatropin therapy. This includes the presence of any intracranial tumor. Somatropin and somatrogon should be discontinued if there is any evidence of recurrence.

Cardiovascular Conditions and Disorders

Major:

Suphedrin Plus

The pseudoephedrine in Suphedrin Plus has a major potential interaction with Cardiovascular Conditions and Disorders.

Sympathomimetic agents may cause adverse cardiovascular effects, particularly when used in high dosages and/or in susceptible patients. In cardiac tissues, these agents may produce positive chronotropic and inotropic effects via stimulation of beta- 1 adrenergic receptors. Cardiac output, oxygen consumption, and the work of the heart may be increased. In the peripheral vasculature, vasoconstriction may occur via stimulation of alpha-1 adrenergic receptors. Palpitations, tachycardia, arrhythmia, hypertension, reflex bradycardia, coronary occlusion, cerebral vasculitis, myocardial infarction, cardiac arrest, and death have been reported. Some of these agents, particularly ephedra alkaloids (ephedrine, ma huang, phenylpropanolamine), may also predispose patients to hemorrhagic and ischemic stroke. Therapy with sympathomimetic agents should generally be avoided or administered cautiously in patients with sensitivity to sympathomimetic amines, hyperthyroidism, or underlying cardiovascular or cerebrovascular disorders. These agents should not be used in patients with severe coronary artery disease or severe/uncontrolled hypertension.

Cerebrovascular Insufficiency

Major:

Suphedrin Plus

The pseudoephedrine in Suphedrin Plus has a major potential interaction with Cerebrovascular Insufficiency.

Sympathomimetic agents may cause adverse cardiovascular effects, particularly when used in high dosages and/or in susceptible patients. In cardiac tissues, these agents may produce positive chronotropic and inotropic effects via stimulation of beta- 1 adrenergic receptors. Cardiac output, oxygen consumption, and the work of the heart may be increased. In the peripheral vasculature, vasoconstriction may occur via stimulation of alpha-1 adrenergic receptors. Palpitations, tachycardia, arrhythmia, hypertension, reflex bradycardia, coronary occlusion, cerebral vasculitis, myocardial infarction, cardiac arrest, and death have been reported. Some of these agents, particularly ephedra alkaloids (ephedrine, ma huang, phenylpropanolamine), may also predispose patients to hemorrhagic and ischemic stroke. Therapy with sympathomimetic agents should generally be avoided or administered cautiously in patients with sensitivity to sympathomimetic amines, hyperthyroidism, or underlying cardiovascular or cerebrovascular disorders. These agents should not be used in patients with severe coronary artery disease or severe/uncontrolled hypertension.

Dehydration

Major:

Suphedrin Plus

The acetaminophen in Suphedrin Plus has a major potential interaction with Dehydration.

Acetaminophen is contraindicated in patients with severe hepatic impairment or severe active liver disease. Patients with hepatic impairment may be at increased risk of toxicity. Severe liver injury, including cases of acute liver failure and death, have been reported in patients using this drug. Clinical monitoring of hepatic function is recommended. Caution is advised if using acetaminophen in patients with chronic malnutrition or severe hypovolemia. Instruct patients to avoid drinking alcohol while taking acetaminophen-containing medications. Patients should be warned not to exceed the maximum recommended total daily dosage of acetaminophen (4 g/day in adults and children 12 years of age or older), and to read all prescription and over-the-counter medication labels to ensure they are not taking multiple acetaminophen-containing products, or check with a healthcare professional if they are unsure.

Diabetes Mellitus

Moderate:

somatropin

Somatropin has a moderate potential interaction with Diabetes Mellitus.

The use of growth hormone has been associated with resistance to insulin. Patients with diabetes mellitus or impaired glucose tolerance should be observed closely during therapy. The dose of antihyperglycemic drugs (insulin or oral/injectable agents) may require adjustment.

Moderate:

Suphedrin Plus

The pseudoephedrine in Suphedrin Plus has a moderate potential interaction with Diabetes Mellitus.

Sympathomimetic agents may cause increases in blood glucose concentrations. These effects are usually transient and slight but may be significant with dosages higher than those normally recommended. Therapy with sympathomimetic agents should be administered cautiously in patients with diabetes mellitus. Closer monitoring of blood glucose concentrations may be appropriate.

Diabetic Retinopathy

Major:

somatropin

Somatropin has a major potential interaction with Diabetic Retinopathy.

Somatropin, somatrogon , and lonapegsomatropin are contraindicated in patients with active proliferative or severe non-proliferative diabetic retinopathy since treatment may worsen condition.

Gastrointestinal Obstruction

Moderate:

Suphedrin Plus

The pseudoephedrine in Suphedrin Plus has a moderate potential interaction with Gastrointestinal Obstruction.

The extended-release formulation of pseudoephedrine (Sudafed 24 Hour) contains a non-deformable material. There have been rare reports of obstructive symptoms in patients with known strictures following the ingestion of similar sustained-release products. Therapy with the extended-release formulation of pseudoephedrine should be administered cautiously in patients with preexisting severe gastrointestinal narrowing or obstruction, whether pathologic or iatrogenic.

Glaucoma/Intraocular Hypertension

Moderate:

Suphedrin Plus

The pseudoephedrine in Suphedrin Plus has a moderate potential interaction with Glaucoma/Intraocular Hypertension.

Sympathomimetic agents can induce transient mydriasis via stimulation of alpha-1 adrenergic receptors. In patients with anatomically narrow angles or narrow-angle glaucoma, pupillary dilation can provoke an acute attack. In patients with other forms of glaucoma, mydriasis may occasionally increase intraocular pressure. Therapy with sympathomimetic agents should be administered cautiously in patients with or predisposed to glaucoma, particularly narrow-angle glaucoma.

Hyperthyroidism

Major:

Suphedrin Plus

The pseudoephedrine in Suphedrin Plus has a major potential interaction with Hyperthyroidism.

Sympathomimetic agents may cause adverse cardiovascular effects, particularly when used in high dosages and/or in susceptible patients. In cardiac tissues, these agents may produce positive chronotropic and inotropic effects via stimulation of beta- 1 adrenergic receptors. Cardiac output, oxygen consumption, and the work of the heart may be increased. In the peripheral vasculature, vasoconstriction may occur via stimulation of alpha-1 adrenergic receptors. Palpitations, tachycardia, arrhythmia, hypertension, reflex bradycardia, coronary occlusion, cerebral vasculitis, myocardial infarction, cardiac arrest, and death have been reported. Some of these agents, particularly ephedra alkaloids (ephedrine, ma huang, phenylpropanolamine), may also predispose patients to hemorrhagic and ischemic stroke. Therapy with sympathomimetic agents should generally be avoided or administered cautiously in patients with sensitivity to sympathomimetic amines, hyperthyroidism, or underlying cardiovascular or cerebrovascular disorders. These agents should not be used in patients with severe coronary artery disease or severe/uncontrolled hypertension.

Liver Disease

Major:

Suphedrin Plus

The acetaminophen in Suphedrin Plus has a major potential interaction with Liver Disease.

Acetaminophen is contraindicated in patients with severe hepatic impairment or severe active liver disease. Patients with hepatic impairment may be at increased risk of toxicity. Severe liver injury, including cases of acute liver failure and death, have been reported in patients using this drug. Clinical monitoring of hepatic function is recommended. Caution is advised if using acetaminophen in patients with chronic malnutrition or severe hypovolemia. Instruct patients to avoid drinking alcohol while taking acetaminophen-containing medications. Patients should be warned not to exceed the maximum recommended total daily dosage of acetaminophen (4 g/day in adults and children 12 years of age or older), and to read all prescription and over-the-counter medication labels to ensure they are not taking multiple acetaminophen-containing products, or check with a healthcare professional if they are unsure.

Lung Cancer

Major:

somatropin

Somatropin has a major potential interaction with Lung Cancer.

Somatropin and somatrogon are contraindicated in the presence of any active malignancy. Any preexistent malignancy should be inactive and its treatment should be completed prior to somatropin therapy. This includes the presence of any intracranial tumor. Somatropin and somatrogon should be discontinued if there is any evidence of recurrence.

Malnourishment

Major:

Suphedrin Plus

The acetaminophen in Suphedrin Plus has a major potential interaction with Malnourishment.

Acetaminophen is contraindicated in patients with severe hepatic impairment or severe active liver disease. Patients with hepatic impairment may be at increased risk of toxicity. Severe liver injury, including cases of acute liver failure and death, have been reported in patients using this drug. Clinical monitoring of hepatic function is recommended. Caution is advised if using acetaminophen in patients with chronic malnutrition or severe hypovolemia. Instruct patients to avoid drinking alcohol while taking acetaminophen-containing medications. Patients should be warned not to exceed the maximum recommended total daily dosage of acetaminophen (4 g/day in adults and children 12 years of age or older), and to read all prescription and over-the-counter medication labels to ensure they are not taking multiple acetaminophen-containing products, or check with a healthcare professional if they are unsure.

Papilledema Associated with Increased Intracranial Pressure

Moderate:

somatropin

Somatropin has a moderate potential interaction with Papilledema Associated with Increased Intracranial Pressure.

Intracranial hypertension with papilledema, visual changes, nausea and/or vomiting has been reported in a small number of patients treated with somatropin, somatrogon , and lonapegsomatropin . Fundoscopic examination should be performed before treatment initiation to exclude preexisting papilledema, and should be continued periodically during treatment. If papilledema is observed during treatment, therapy should be stopped. Treatment could be restarted at a lower dose once intracranial hypertension has been resolved. Patients with Turner Syndrome might be at increased risk of developing intracranial hypertension.

Phenylketonuria

Moderate:

Suphedrin Plus

The pseudoephedrine in Suphedrin Plus has a moderate potential interaction with Phenylketonuria.

Chewable products frequently may contain aspartame, which is metabolized in the gastrointestinal tract to phenylalanine. Sudafed (brand of pseudoephedrine) chewable 15 mg tablets provide the equivalent of 0.78 mg of phenylalanine per each tablet. The aspartame/phenylalanine content should be considered when this and similar products are used in patients who must restrict their intake of phenylalanine (i.e. phenylketonurics).

Moderate:

Suphedrin Plus

The acetaminophen in Suphedrin Plus has a moderate potential interaction with Phenylketonuria.

Several oral acetaminophen and acetaminophen-combination products, particularly flavored chewable tablets, contain the artificial sweetener, aspartame (NutraSweet). Aspartame is converted to phenylalanine in the gastrointestinal tract following ingestion. Chewable and effervescent formulations of acetaminophen products may also contain phenylalanine. The aspartame/phenylalanine content should be considered when these products are used in patients who must restrict their intake of phenylalanine (i.e. phenylketonurics).

Pheochromocytoma

Major:

Suphedrin Plus

The pseudoephedrine in Suphedrin Plus has a major potential interaction with Pheochromocytoma.

Sympathomimetic agents may cause adverse cardiovascular effects, particularly when used in high dosages and/or in susceptible patients. In cardiac tissues, these agents may produce positive chronotropic and inotropic effects via stimulation of beta- 1 adrenergic receptors. Cardiac output, oxygen consumption, and the work of the heart may be increased. In the peripheral vasculature, vasoconstriction may occur via stimulation of alpha-1 adrenergic receptors. Palpitations, tachycardia, arrhythmia, hypertension, reflex bradycardia, coronary occlusion, cerebral vasculitis, myocardial infarction, cardiac arrest, and death have been reported. Some of these agents, particularly ephedra alkaloids (ephedrine, ma huang, phenylpropanolamine), may also predispose patients to hemorrhagic and ischemic stroke. Therapy with sympathomimetic agents should generally be avoided or administered cautiously in patients with sensitivity to sympathomimetic amines, hyperthyroidism, or underlying cardiovascular or cerebrovascular disorders. These agents should not be used in patients with severe coronary artery disease or severe/uncontrolled hypertension.

Prostate Cancer

Major:

somatropin

Somatropin has a major potential interaction with Prostate Cancer.

Somatropin and somatrogon are contraindicated in the presence of any active malignancy. Any preexistent malignancy should be inactive and its treatment should be completed prior to somatropin therapy. This includes the presence of any intracranial tumor. Somatropin and somatrogon should be discontinued if there is any evidence of recurrence.

Prostate Tumor, Benign

Moderate:

Suphedrin Plus

The pseudoephedrine in Suphedrin Plus has a moderate potential interaction with Prostate Tumor, Benign.

Sympathomimetic agents may cause or worsen urinary difficulty in patients with prostate enlargement due to smooth muscle contraction in the bladder neck via stimulation of alpha-1 adrenergic receptors. Therapy with sympathomimetic agents should be administered cautiously in patients with hypertrophy or neoplasm of the prostate.

Pulmonary Impairment

Major:

somatropin

Somatropin has a major potential interaction with Pulmonary Impairment.

Somatropin and somatrogon is contraindicated in patients with Prader-Willi Syndrome who are severely obese, have a history of upper airway obstruction or sleep apnea, or have severe respiratory impairment. There have been reports of sudden death when somatropin was used in such patients.

Major:

somatropin

Somatropin has a major potential interaction with Pulmonary Impairment.

Treatment with somatropin and somatrogon is contraindicated in patients with acute critical illness due to any complications following open heart surgery, abdominal surgery, multiple trauma, or acute respiratory failure. Patients with these conditions have an increased risk of mortality.

Scoliosis

Moderate:

somatropin

Somatropin has a moderate potential interaction with Scoliosis.

Progression of scoliosis can occur in patients who experience rapid growth. Since somatropin and somatrogon increase growth rate, children with a history of scoliosis should be monitored for progression of this condition. Physicians should be alert for this skeletal abnormality which can be commonly seen in patients with Turner and Prader-Willi syndromes, and can manifest during somatropin and somatrogon treatment.

Sepsis

Major:

somatropin

Somatropin has a major potential interaction with Sepsis.

Treatment with somatropin and somatrogon is contraindicated in patients with acute critical illness due to any complications following open heart surgery, abdominal surgery, multiple trauma, or acute respiratory failure. Patients with these conditions have an increased risk of mortality.

Skin Cancer

Major:

somatropin

Somatropin has a major potential interaction with Skin Cancer.

Somatropin and somatrogon are contraindicated in the presence of any active malignancy. Any preexistent malignancy should be inactive and its treatment should be completed prior to somatropin therapy. This includes the presence of any intracranial tumor. Somatropin and somatrogon should be discontinued if there is any evidence of recurrence.

Sleep Apnea

Major:

somatropin

Somatropin has a major potential interaction with Sleep Apnea.

Somatropin and somatrogon is contraindicated in patients with Prader-Willi Syndrome who are severely obese, have a history of upper airway obstruction or sleep apnea, or have severe respiratory impairment. There have been reports of sudden death when somatropin was used in such patients.

Turner Syndrome

Moderate:

somatropin

Somatropin has a moderate potential interaction with Turner Syndrome.

Somatropin may increase the risk of otitis media in patients with Turner syndrome. These patients should be evaluated carefully for otitis media and other ear disorders as they have an increased risk of ear and hearing disorders.

Underactive Thyroid

Moderate:

somatropin

Somatropin has a moderate potential interaction with Underactive Thyroid.

The use of growth hormone has been associated with the development of hypothyroidism. Patients should be monitored baseline and periodically for adequate thyroid function. Inadequate treatment of hypothyroidism may inhibit the optimal response to growth hormone.

Weight Loss

Major:

somatropin

Somatropin has a major potential interaction with Weight Loss.

Somatropin and somatrogon is contraindicated in patients with Prader-Willi Syndrome who are severely obese, have a history of upper airway obstruction or sleep apnea, or have severe respiratory impairment. There have been reports of sudden death when somatropin was used in such patients.

More resources

somatropin

A total of 654 drugs are known to interact with somatropin.

Suphedrin Plus

A total of 747 drugs are known to interact with Suphedrin Plus.

Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.