Calan (Verapamil Injection) and Phenobarbital Oral Solution
Determining the interaction of Calan (Verapamil Injection) and Phenobarbital Oral Solution and the possibility of their joint administration.
In the database of official manuals used in the service creation an interaction registered by statistical results of studies was found, which can either lead to negative consequences for the patient health or strengthen a mutual positive effect. A doctor should be consulted to address the issue of joint drug administration.
Consumer:Before taking verapamil, tell your doctor if you also use PHENobarbital. You may need dose adjustments or special tests in order to safely take both medications together. You should monitor your blood pressure more closely for changes while taking verapamil whenever PHENobarbital is started or stopped. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using your medications without first talking to your doctor first.
Professional:MONITOR: Some barbiturates may significantly decrease serum verapamil concentrations and half-life, especially with oral dosage forms. The mechanism is induction of CYP450 3A4 first-pass metabolism of verapamil.
MANAGEMENT: Close observation for reduced verapamil effect is recommended if these drugs must be used together. Dose adjustments may be required. Patients should also be monitored for verapamil toxicity after the barbiturate is discontinued.
- Rutledge DR, Pieper JA, Mirvis DM "Effects of chronic phenobarbital on verapamil dispostion in humans." J Pharmacol Exp Ther 246 (1988): 7-13
Generic Name: verapamil
Brand name: Calan, Calan SR, Isoptin SR, Verelan, Isoptin, Isoptin IV, Covera-HS, Verelan PM
Synonyms: Calan Immediate-Release Tablets, Calan
Generic Name: phenobarbital
Brand name: Solfoton, Luminal
Synonyms: Phenobarbital, PHENobarbital
In the course of checking the drug compatibility and interactions, data from the following reference sources was used: Drugs.com, Rxlist.com, Webmd.com, Medscape.com.
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