Skip to main content

Drug Interactions between Broncotron and osilodrostat

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

Edit list (add/remove drugs)

Interactions between your drugs

Moderate

dextromethorphan osilodrostat

Applies to: Broncotron (dextromethorphan / guaifenesin) and osilodrostat

MONITOR: Coadministration with osilodrostat may increase the plasma concentrations of drugs that are metabolized by CYP450 1A2, 2C19, 2D6, and/or 3A4. Osilodrostat has been shown to be a moderate inhibitor of CYP450 1A2, a mild to borderline moderate inhibitor of CYP450 2C19, and a weak inhibitor of CYP450 2D6 and 3A4. In a pharmacokinetic study with 20 healthy volunteers using a single 50 mg dose of osilodrostat and a probe drug cocktail, osilodrostat increased the exposures to caffeine (CYP450 1A2 substrate), omeprazole (CYP450 2C19 substrate), dextromethorphan (CYP450 2D6 substrate), and midazolam (CYP450 3A4/5 substrate) by 2.5-, 1.9-, 1.5- and 1.5-fold, respectively.

MANAGEMENT: Caution is advised when osilodrostat is used concurrently with drugs that are substrates of CYP450 1A2, 2C19, 2D6 and/or 3A4, particularly those with a narrow therapeutic range. Dosage adjustments as well as clinical and laboratory monitoring may be appropriate for some drugs whenever osilodrostat is added to or withdrawn from therapy.

References (3)
  1. (2024) "Product Information. Isturisa (osilodrostat)." Recordati Rare Diseases Australia Pty Ltd, 4.0
  2. (2025) "Product Information. Isturisa (osilodrostat)." Recordati Rare Diseases UK Ltd
  3. (2025) "Product Information. Isturisa (osilodrostat)." Recordati Rare Diseases Inc

Drug and food/lifestyle interactions

Moderate

dextromethorphan food/lifestyle

Applies to: Broncotron (dextromethorphan / guaifenesin)

GENERALLY AVOID: Alcohol may potentiate some of the pharmacologic effects of CNS-active agents. Use in combination may result in additive central nervous system depression and/or impairment of judgment, thinking, and psychomotor skills.

MANAGEMENT: Patients receiving CNS-active agents should be warned of this interaction and advised to avoid or limit consumption of alcohol. Ambulatory patients should be counseled to avoid hazardous activities requiring complete mental alertness and motor coordination until they know how these agents affect them, and to notify their physician if they experience excessive or prolonged CNS effects that interfere with their normal activities.

References (4)
  1. Warrington SJ, Ankier SI, Turner P (1986) "Evaluation of possible interactions between ethanol and trazodone or amitriptyline." Neuropsychobiology, 15, p. 31-7
  2. Gilman AG, eds., Nies AS, Rall TW, Taylor P (1990) "Goodman and Gilman's the Pharmacological Basis of Therapeutics." New York, NY: Pergamon Press Inc.
  3. (2012) "Product Information. Fycompa (perampanel)." Eisai Inc
  4. (2015) "Product Information. Rexulti (brexpiprazole)." Otsuka American Pharmaceuticals Inc

Disease interactions

Moderate

osilodrostat Adrenal Insufficiency

Applies to: Adrenal Insufficiency

Osilodrostat lowers cortisol levels and can lead to hypocortisolism and sometimes life-threatening adrenal insufficiency. Patients should be evaluated for precipitating causes of hypocortisolism. Serum/plasma cortisol, 24-hour urine free cortisol, and patient's signs/symptoms should be monitored periodically during treatment. Osilodrostat should be decreased or temporarily discontinued if urine free cortisol levels fall below the target range, there is a rapid decrease in cortisol levels, and/or patients report hypocortisolism symptoms. Therapy should be stopped and exogenous glucocorticoid replacement therapy should be administered if serum/plasma cortisol levels are below the target range and patients have symptoms of adrenal insufficiency. Osilodrostat should be restarted at a lower dose when urine free cortisol and serum/plasma cortisol levels are within the target range, and/or patient symptoms have resolved.

Moderate

osilodrostat Arrhythmias

Applies to: Arrhythmias

The use of osilodrostat is associated with a dose-dependent QT interval prolongation, which may cause cardiac arrhythmias. It is recommended to perform an ECG to obtain a baseline QTc interval measurement before starting therapy and to monitor for an effect on the QTc interval thereafter. Temporary discontinuation of osilodrostat should be considered in the case of an increase in QTc interval greater than 480 milliseconds. Hypokalemia and hypomagnesemia should be corrected before initiating treatment and monitored regularly during treatment. Electrolyte abnormalities should be corrected if indicated. Care should be exercised when using this agent in patients with risk factors for QT prolongation and more frequent ECG monitoring should be considered.

Moderate

osilodrostat Congestive Heart Failure

Applies to: Congestive Heart Failure

The use of osilodrostat is associated with a dose-dependent QT interval prolongation, which may cause cardiac arrhythmias. It is recommended to perform an ECG to obtain a baseline QTc interval measurement before starting therapy and to monitor for an effect on the QTc interval thereafter. Temporary discontinuation of osilodrostat should be considered in the case of an increase in QTc interval greater than 480 milliseconds. Hypokalemia and hypomagnesemia should be corrected before initiating treatment and monitored regularly during treatment. Electrolyte abnormalities should be corrected if indicated. Care should be exercised when using this agent in patients with risk factors for QT prolongation and more frequent ECG monitoring should be considered.

Moderate

osilodrostat Electrolyte Abnormalities

Applies to: Electrolyte Abnormalities

The use of osilodrostat is associated with a dose-dependent QT interval prolongation, which may cause cardiac arrhythmias. It is recommended to perform an ECG to obtain a baseline QTc interval measurement before starting therapy and to monitor for an effect on the QTc interval thereafter. Temporary discontinuation of osilodrostat should be considered in the case of an increase in QTc interval greater than 480 milliseconds. Hypokalemia and hypomagnesemia should be corrected before initiating treatment and monitored regularly during treatment. Electrolyte abnormalities should be corrected if indicated. Care should be exercised when using this agent in patients with risk factors for QT prolongation and more frequent ECG monitoring should be considered.

Moderate

osilodrostat Hypokalemia

Applies to: Hypokalemia

The use of osilodrostat is associated with a dose-dependent QT interval prolongation, which may cause cardiac arrhythmias. It is recommended to perform an ECG to obtain a baseline QTc interval measurement before starting therapy and to monitor for an effect on the QTc interval thereafter. Temporary discontinuation of osilodrostat should be considered in the case of an increase in QTc interval greater than 480 milliseconds. Hypokalemia and hypomagnesemia should be corrected before initiating treatment and monitored regularly during treatment. Electrolyte abnormalities should be corrected if indicated. Care should be exercised when using this agent in patients with risk factors for QT prolongation and more frequent ECG monitoring should be considered.

Moderate

osilodrostat Liver Disease

Applies to: Liver Disease

Dosage adjustment of osilodrostat is required for patients with moderate to severe liver dysfunction. The recommended starting dose for patients with moderate liver dysfunction is 1 mg orally twice a day, and for patients with severe liver dysfunction is 1 mg orally once a day in the evening. No dose adjustment is required in patients with mild liver dysfunction. More frequent monitoring of adrenal function may be needed during dose titration in all patients with liver dysfunction.

Moderate

osilodrostat Magnesium Imbalance

Applies to: Magnesium Imbalance

The use of osilodrostat is associated with a dose-dependent QT interval prolongation, which may cause cardiac arrhythmias. It is recommended to perform an ECG to obtain a baseline QTc interval measurement before starting therapy and to monitor for an effect on the QTc interval thereafter. Temporary discontinuation of osilodrostat should be considered in the case of an increase in QTc interval greater than 480 milliseconds. Hypokalemia and hypomagnesemia should be corrected before initiating treatment and monitored regularly during treatment. Electrolyte abnormalities should be corrected if indicated. Care should be exercised when using this agent in patients with risk factors for QT prolongation and more frequent ECG monitoring should be considered.

Moderate

osilodrostat Renal Dysfunction

Applies to: Renal Dysfunction

No dosage adjustment of osilodrostat is required for patients with impaired renal function. However, in patients with moderate to severe renal dysfunction, urinary free cortisol (UFC) levels should be interpreted with caution due to reduced UFC excretion.

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.


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.