Bentyl Side Effects

Generic Name: dicyclomine

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

Not all side effects for Bentyl may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

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

General

-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.

Gastrointestinal

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

Ocular

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

Other

Common (1% to 10%): Asthenia
Frequency not reported: Fatigue
Postmarketing reports: Malaise, fatigue

Dermatologic

Rare (less than 0.1%): Rash
Postmarketing reports: Allergic dermatitis, erythema, rash

Renal

Rare (less than 0.1%): Dysuria

Genitourinary

Frequency not reported: Urinary retention, impotence in male patients
Postmarketing reports: Suppressed lactation

Cardiovascular

Postmarketing reports: Palpitations, tachyarrhythmias, thrombosis, thrombophlebitis

Hypersensitivity

Postmarketing reports: Face edema, angioedema, anaphylactic shock

Local

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

Psychiatric

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).

Respiratory

Postmarketing reports: Dyspnea, nasal congestion

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