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Generic Name: Dicyclomine Injection (dye SYE kloe meen)
Brand Name: Bentyl
Easy-to-read patient leaflet for Bentyl (Dicyclomine Injection). Includes indications, proper use, special instructions, precautions, and possible side effects.

Average Savings for dicyclomine hydrochloride (generic): 27.08%
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Drug Information:
For all patients taking Bentyl (dicyclomine injection): Children: This is not a list of all drugs or health problems that interact with Bentyl (dicyclomine injection). Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take Bentyl (dicyclomine injection) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor. Learn more

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Bentyl Side Effects

Note: This document contains side effect information about dicyclomine. Some of the dosage forms listed on this page may not apply to the brand name Bentyl.

For the Consumer

Applies to dicyclomine: oral capsules and tablets, oral solution, parenteral injection

Side effects include:

Most adverse effects are manifestations of pharmacologic effects at muscarinic-cholinergic receptors and usually are reversible when therapy is discontinued.

Severity and frequency of adverse effects are dose related and individual intolerance varies greatly; although adverse effects occasionally may be obviated by a reduction in dosage, this also will likely eliminate potential therapeutic effects. If dosage of ≥80 mg daily cannnot be achieved because of intolerance, discontinue dicyclomine (the active ingredient contained in Bentyl)

Dry mouth, dizziness, blurred vision, nausea, light-headedness (especially with the injectable form), drowsiness, weakness, nervousness.

For Healthcare Professionals

Applies to dicyclomine: compounding powder, intramuscular solution, oral capsule, oral syrup, oral tablet


-The most serious adverse reactions include cardiovascular and central nervous system symptoms.

-The most common adverse reactions are dizziness, dry mouth, vision blurred, nausea, somnolence, asthenia and nervousness, fever, tachycardia, agitation, and dry skin/mucous membranes.


Very common (10% or more): Dry mouth (33%), nausea (14%)

Rare (less than 0.1%): Constipation, anorexia

Frequency not reported: Thirst, delayed gastric emptying time, reduced gastric acid secretion, gastroesophageal reflux

Postmarketing reports: Abdominal distension, abdominal pain, dyspepsia, constipation, dry mouth, nausea, vomiting

Nervous system

Very common (10% or more): Dizziness (40%)

Common (1% to 10%): Somnolence, nervousness

Rare (less than 0.1%): Sedation, headache

Postmarketing reports: Dizziness, headache, somnolence, syncope


Very common (10% or more): Blurred vision (27%)

Frequency not reported: Follicular conjunctivitis, all muscarinic antagonists can precipitate glaucoma

Postmarketing reports: Cycloplegia, mydriasis, blurred vision


Common (1% to 10%): Asthenia

Frequency not reported: Fatigue

Postmarketing reports: Malaise, fatigue


Rare (less than 0.1%): Rash

Postmarketing reports: Allergic dermatitis, erythema, rash


Rare (less than 0.1%): Dysuria


Frequency not reported: Urinary retention, impotence in male patients

Postmarketing reports: Suppressed lactation


Postmarketing reports: Palpitations, tachyarrhythmias, thrombosis, thrombophlebitis


Postmarketing reports: Face edema, angioedema, anaphylactic shock


Postmarketing reports: Local pain, edema, skin color change, reflex sympathetic dystrophy syndrome (caused by inadvertent IV injection)


Postmarketing reports: Delirium or symptoms of delirium such as amnesia (or transient global amnesia), nervousness, agitation, confusional state, delusion, disorientation, hallucination (including visual hallucination), and mania, mood (altered and pseudodementia).


Postmarketing reports: Dyspnea, nasal congestion

Editorial References and Review

Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/1/2020.

Source: Drugs.com Bentyl (www.drugs.com/bentyl.html).