Verapamil

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Chemical structure of Verapamil
Verapamil
Systematic (IUPAC) name
2-(3,4-dimethoxyphenyl)-5-[2-(3,4-
dimethoxyphenyl)ethyl-methyl-amino]
-2-(1-methylethyl)pentanenitrile
Identifiers
CAS number 52-53-9
ATC code C08DA01
PubChem 62969
DrugBank APRD00335
Chemical data
Formula C27H38N2O4 
Mol. mass 454.602 g/mol
Pharmacokinetic data
Bioavailability 35.1%
Metabolism Hepatic
Half life 2.8-7.4 hours
Excretion Renal: 11%
Therapeutic considerations
Pregnancy cat.

C: (USA)
Legal status

Rx Only
Routes Oral, Intravenous

Verapamil (brand names: Isoptin®, Verelan®, Calan®, Bosoptin®) is a medical drug that acts as an L-type calcium channel blocker.

Contents

[edit] Indications

It is used in the treatment of hypertension, angina pectoris, and some types of arrhythmia.

Verapamil is used to treat irregular heartbeats (arrhythmias), migraines and high blood pressure. It relaxes the blood vessels so the heart does not have to pump as hard. It also increases the supply of blood and oxygen to the heart to control chest pain (angina). If taken regularly, verapamil controls chest pain, but it does not stop chest pain once it starts. Your doctor may give you a different medication to take when you have chest pain.

Verapamil is a class IV antiarrhythmic agent, and decreases conduction through the AV node.

Verapamil can be used as a vasodilator during cryopreservation of blood vessels.

[edit] Pharmacokinetic details

Given orally, 90-100% is absorbed, but due to high first-pass metabolism, bioavailability is much lower (10-35%). It is 90% plasma protein bound and has a volume of distribution of 3-5 l kg-1. It is metabolized in the liver to at least 12 inactive metabolites. 70% is excreted in the urine as metabolites, 16% in feces and 3-4% unchanged in urine.

[edit] Side effects

Some possible side effects of the drug are headaches, facial flushing, dizziness, swelling, increased urination, and constipation.

[edit] Uses in cell biology

Verapamil is also used in cell biology as an inhibitor of drug efflux pump proteins such as P-glycoprotein.[1] This is useful as many tumor cell lines overexpress drug efflux pumps, limiting the effectiveness of cytotoxic drugs or fluorescent tags. It's also used in fluorescent cell sorting for DNA content, as it blocks efflux of a variety of DNA-binding fluorochromes such as Hoechst 33342.

[edit] Overdose

In case of overdose, call your local poison control center. If the victim has collapsed or is not breathing, call emergency medical services at 112 (U.S. citizens call 911). In Australia, dial 000 from a landline (normal phone) or 112 from a mobile phone.

[edit] Sources

  1. ^ Bellamy WT. P-glycoproteins and multidrug resistance. Annu Rev Pharmacol Toxicol 1996; 36:161-83. PMID 8725386
v • d • e
Calcium channel blockers (C08)
Dihydropyridines Amlodipine, Felodipine, Isradipine, Lacidipine, Lercanidipine, Nicardipine, Nifedipine, Nimodipine, Nisoldipine
Phenylalkylamines Verapamil
Benzothiazepines Diltiazem
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