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Drug Interactions between Inzirqo and topiramate

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

Moderate

hydroCHLOROthiazide topiramate

Applies to: Inzirqo (hydrochlorothiazide) and topiramate

MONITOR: Coadministration with thiazide-like diuretics, such as hydrochlorothiazide, may enhance the hypokalemic effects and increase the serum concentrations of topiramate. The mechanism for this interaction has not been delineated. The results of a clinical study involving healthy subjects showed that following administration of hydrochlorothiazide, the Cmax and AUC of topiramate increased by 27% and 29%, respectively. In addition, decreases in serum potassium were greater when hydrochlorothiazide and topiramate were given concomitantly compared to when either was given alone.

MANAGEMENT: Until more information is available, caution is advised if topiramate is administered with a thiazide-like diuretic, such as hydrochlorothiazide. Dosage adjustments as well as clinical and laboratory monitoring of topiramate should be considered whenever a thiazide-like diuretic is added to or withdrawn from therapy. Serum potassium levels should also be monitored during concomitant therapy. Patients should be observed for the development of topiramate adverse effects.

References (4)
  1. (2001) "Product Information. Topamax (topiramate)." Ortho McNeil Pharmaceutical
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics."
  3. Cerner Multum, Inc. "Australian Product Information."
  4. (2017) "Product Information. Topiramate (topiramate)." Cipla USA Inc.

Drug and food interactions

Moderate

hydroCHLOROthiazide food

Applies to: Inzirqo (hydrochlorothiazide)

MONITOR: Many psychotherapeutic and CNS-active agents (e.g., anxiolytics, sedatives, hypnotics, antidepressants, antipsychotics, opioids, alcohol, muscle relaxants) exhibit hypotensive effects, especially during initiation of therapy and dose escalation. Coadministration with antihypertensives and other hypotensive agents, in particular vasodilators and alpha-blockers, may result in additive effects on blood pressure and orthostasis.

MANAGEMENT: Caution and close monitoring for development of hypotension is advised during coadministration of these agents. Some authorities recommend avoiding alcohol in patients receiving vasodilating antihypertensive drugs. Patients should be advised to avoid rising abruptly from a sitting or recumbent position and to notify their physician if they experience dizziness, lightheadedness, syncope, orthostasis, or tachycardia. Patients should also avoid driving or operating hazardous machinery until they know how the medications affect them.

References (10)
  1. Sternbach H (1991) "Fluoxetine-associated potentiation of calcium-channel blockers." J Clin Psychopharmacol, 11, p. 390-1
  2. Shook TL, Kirshenbaum JM, Hundley RF, Shorey JM, Lamas GA (1984) "Ethanol intoxication complicating intravenous nitroglycerin therapy." Ann Intern Med, 101, p. 498-9
  3. Feder R (1991) "Bradycardia and syncope induced by fluoxetine." J Clin Psychiatry, 52, p. 139
  4. Ellison JM, Milofsky JE, Ely E (1990) "Fluoxetine-induced bradycardia and syncope in two patients." J Clin Psychiatry, 51, p. 385-6
  5. Rodriguez de la Torre B, Dreher J, Malevany I, et al. (2001) "Serum levels and cardiovascular effects of tricyclic antidepressants and selective serotonin reuptake inhibitors in depressed patients." Ther Drug Monit, 23, p. 435-40
  6. Cerner Multum, Inc. "Australian Product Information."
  7. Pacher P, Kecskemeti V (2004) "Cardiovascular side effects of new antidepressants and antipsychotics: new drugs, old concerns?" Curr Pharm Des, 10, p. 2463-75
  8. Andrews C, Pinner G (1998) "Postural hypotension induced by paroxetine." BMJ, 316, p. 595
  9. (2023) "Product Information. Buprenorphine (buprenorphine)." G.L. Pharma UK Ltd
  10. (2023) "Product Information. Temgesic (buprenorphine)." Reckitt Benckiser Pty Ltd

Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

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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

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