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Dicyclomine Side Effects

Not all side effects for dicyclomine 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.

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.[Ref]


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[Ref]

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[Ref]


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[Ref]


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


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


Rare (less than 0.1%): Dysuria[Ref]


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


Postmarketing reports: Palpitations, tachyarrhythmias, thrombosis, thrombophlebitis[Ref]


Postmarketing reports: Face edema, angioedema, anaphylactic shock[Ref]


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


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).[Ref]


Postmarketing reports: Dyspnea, nasal congestion[Ref]


1. Kagan G, Huddlestone L, Wolstencroft P "Comparison of dicyclomine with antacid and without antacid in dyspepsia." J Int Med Res 12 (1984): 174-8

2. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0

3. "Product Information. Bentyl (dicyclomine)." Aventis Pharmaceuticals, Kansas City, MO.

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