Does Cimetidine Interact with Perphenazine And Amitriptyline Hydrochloride?
Cimetidine and Perphenazine And Amitriptyline Hydrochloride have a major drug interaction according to U.S. FDA drug labeling data. Cimetidine inhibits cytochrome P450 2D6, potentially causing toxic amitriptyline concentrations; dose reduction may be necessary. The mechanism involves inhibition of cytochrome p450 2d6. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.
- Severity
- Major
- Cimetidine Class
- Histamine-2 Receptor Antagonist
- Perphenazine And Amitriptyline Hydrochloride Class
- Phenothiazine
- Management
- Close medical supervision required
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Cimetidine and Perphenazine And Amitriptyline Hydrochloride occurs because inhibition of cytochrome p450 2d6. Clinically, this means cimetidine inhibits cytochrome p450 2d6, potentially causing toxic amitriptyline concentrations; dose reduction may be necessary. This is classified as a major interaction, meaning it could cause serious harm if not properly managed. Your healthcare provider may need to adjust dosages, substitute one medication, or increase monitoring frequency.
What To Tell Your Doctor or Pharmacist
If you are taking Cimetidine and your doctor is considering prescribing Perphenazine And Amitriptyline Hydrochloride (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask how frequently you should be monitored while these are co-prescribed
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider