dicyclomine, Bentyl

Pharmacy Author:
Medical and Pharmacy Editor:

GENERIC NAME: dicyclomine


DRUG CLASS AND MECHANISM: Dicyclomine is a drug that is used for treating irritable bowel syndrome (IBS). Dicyclomine is in a class of drugs called anticholinergics. Anticholinergic drugs block the effects of acetylcholine, the chemical transmitter that nerves release in order to cause muscles to contract. They prevent contraction of the muscles by blocking the acetylcholine receptors on the muscle cells. Anticholinergic drugs also have a direct relaxing effect on muscle. Dicyclomine is used to reduce contraction of the muscles in the intestines. Dicyclomine was approved by the FDA in 1950.



PREPARATIONS: Capsules: 10 mg. Tablets: 20 mg. Syrup: 10 mg/5 mL. Injection (Intramuscular): 10 mg/ mL

STORAGE: Capsules and tablets should be stored at room temperature, between 15 C to 30 C (59 F to 86 F).

PRESCRIBED FOR: Dicyclomine is used in the treatment of irritable bowel syndrome.

DOSING: The recommended starting oral dose of dicyclomine is 20 mg given 4 times daily. The dose can be increased to 40 mg 4 times daily. The recommended intramuscular injection is 10 to 20 mg 4 times daily.

DRUG INTERACTIONS: Excessive anticholinergic effects may occur when dicyclomine is combined with other drugs with anticholinergic effects such as diphenhydramine (Benadryl), promethazine (Phenergan), thioridazine (Mellaril), triflupromazine (Stelazine), amitriptyline (Elavil, Endep), amoxapine (Asendin), clomipramine (Anafranil), protriptyline (Vivactil), clozapine (Clozaril), cyclobenzaprine (Flexeril), and disopyramide (Norpace). The combined effects of these drugs can lead to a greater incidence of dry mouth, blurred vision, confusion, agitation, increased heart rate, palpitations, constipation, and urinary retention (difficulty urinating). Combining narcotics such as oxycodone (Percocet, Percodan), hydrocodone (Vicodin) with dicyclomine may reduce function of the muscles of the bowel and bladder resulting in greater constipation and difficulty urinating than with dicyclomine alone. Combining dicyclomine with pramlintide (Symlin) also reduces bowel movements more than either drug alone.

Medically Reviewed by a Doctor on 12/2/2014

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Pill Finder Tool

Need help identifying pills and medications?
Use the pill identifier tool on RxList.

Back to Medications Index