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All about: Dicyclomine capsules

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Generic Name: Dicyclomine hydrochloride
Dosage Form: Capsules

10 mg

Rx only

Dicyclomine Description

Dicyclomine hydrochloride is an antispasmodic and anticholinergic (antimuscarinic) agent.

Chemically, Dicyclomine hydrochloride is [bicyclohexyl]-1-carboxylic acid, 2-(diethylamino) ethyl ester, hydrochloride with the following structural formula, molecular weight, and molecular formula:

C19H35NO2 • HCl
M.W. 345.96

Dicyclomine hydrochloride occurs as a fine, white, crystalline, practically odorless powder with a bitter taste. It is soluble in water, freely soluble in alcohol and chloroform, and very slightly soluble in ether.

Dicyclomine hydrochloride capsules, for oral administration, contain 10 mg of Dicyclomine hydrochloride, USP. In addition, each capsule contains the following inactive ingredients: anhydrous lactose, colloidal silicon dioxide, D&C yellow no. 10 aluminum lake, FD&C blue #1, FD&C blue no. 1 aluminum lake, FD&C blue no. 2 aluminum lake, FD&C red no. 40 aluminum lake, gelatin, magnesium stearate, microcrystalline cellulose, n-Butyl alcohol, pharmaceutical glaze (modified) in SD-45, pregelatinized (corn) starch, propylene glycol, SDA-3A alcohol, sodium lauryl sulfate, synthetic black iron oxide and titanium dioxide.

Dicyclomine - Clinical Pharmacology

Dicyclomine relieves smooth muscle spasm of the gastrointestinal tract. Animal studies indicate that this action is achieved via a dual mechanism: (1) a specific anticholinergic effect (antimuscarinic) at the acetylcholine-receptor sites with approximately 1/8 the milligram potency of atropine (in vitro, guinea pig ileum); and (2) a direct effect upon smooth muscle (musculotropic) as evidenced by Dicyclomine's antagonism of bradykininand histamine-induced spasms of the isolated guinea pig ileum. Atropine did not affect responses to these two agonists. In vivo studies in cats and dogs showed Dicyclomine to be equally potent against acetylcholine (ACh)- or barium chloride (BaCl2)-induced intestinal spasm while atropine was at least 200 times more potent against effects of ACh than BaCl2. Tests for mydriatic effects in mice showed that Dicyclomine was approximately 1/500 as potent as atropine; antisialagogue tests in rabbits showed Dicyclomine to be 1/300 as potent as atropine.

In man, Dicyclomine is rapidly absorbed after oral administration, reaching peak values within 60 to 90 minutes. The principal route of elimination is via the urine (79.5% of the dose). Excretion also occurs in the feces, but to a lesser extent (8.4%). Mean half-life of plasma elimination in one study was determined to be approximately 1.8 hours when plasma concentrations were measured for 9 hours after a single dose. In subsequent studies, plasma concentrations were followed for up to 24 hours after a single dose, showing a secondary phase of elimination with a somewhat longer half-life. Mean volume of distribution for a 20 mg oral dose is approximately 3.65 L/kg suggesting extensive distribution in tissues.

In controlled clinical trials involving over 100 patients who received drug, 82% of patients treated for functional bowel/irritable bowel syndrome with Dicyclomine hydrochloride at initial doses of 160 mg daily (40 mg q.i.d.) demonstrated a favorable clinical response compared with 55% treated with placebo (P <0.05). In these trials, most of the side effects were typically anticholinergic in nature (see table) and were reported by 61% of the patients.

Side Effect Dicyclomine Hydrochloride
(40 mg q.i.d.) %
Placebo %
Dry Mouth 33 5
Dizziness 29 2
Blurred Vision 27 2
Nausea 14 6
Light-Headedness 11 3
Drowsiness 9 1
Weakness 7 1
Nervousness 6 2

Nine percent (9%) of patients were discontinued from the drug because of one or more of these side effects (compared with 2% in the placebo group). In 41% of the patients with side effects, side effects disappeared or were tolerated at the 160 mg daily dose without reduction. A dose reduction from 160 mg daily to an average daily dose of 90 mg was required in 46% of the patients with side effects who then continued to experience a favorable clinical response; their side effects either disappeared or were tolerated. (See ADVERSE REACTIONS.)

Indications and Usage for Dicyclomine

For the treatment of functional bowel/irritable bowel syndrome.


  1. Obstructive uropathy.
  2. Obstructive disease of the gastrointestinal tract.
  3. Severe ulcerative colitis. (See PRECAUTIONS.)
  4. Reflux esophagitis.
  5. Unstable cardiovascular status in acute hemorrhage.
  6. Glaucoma.
  7. Myasthenia gravis.
  8. Evidence of prior hypersensitivity to Dicyclomine hydrochloride or other ingredients of these formulations.
  9. Infants less than 6 months of age. (See WARNINGS and PRECAUTIONS: Information for Patients.)
  10. Nursing mothers. (See WARNINGS and PRECAUTIONS: Information for Patients.)


In the presence of a high environmental temperature, heat prostration can occur with drug use (fever and heat stroke due to decreased sweating). If symptoms occur, the drug should be discontinued and supportive measures instituted.

Diarrhea may be an early symptom of incomplete intestinal obstruction, especially in patients with ileostomy or colostomy. In this instance, treatment with this drug would be inappropriate and possibly harmful.

Dicyclomine hydrochloride may produce drowsiness or blurred vision. The patient should be warned not to engage in activities requiring mental alertness, such as operating a motor vehicle or other machinery or performing hazardous work while taking this drug.

Psychosis has been reported in sensitive individuals given anticholinergic drugs. CNS signs and symptoms include confusion, disorientation, short-term memory loss, hallucinations, dysarthria, ataxia, coma, euphoria, decreased anxiety, fatigue, insomnia, agitation and mannerisms, and inappropriate affect.

These CNS signs and symptoms usually resolve within 12 to 24 hours after discontinuation of the drug.

There are reports that administration of Dicyclomine hydrochloride syrup to infants has been followed by serious respiratory symptoms (dyspnea, shortness of breath, breathlessness, respiratory collapse, apnea, asphyxia), seizures, syncope, pulse rate fluctuations, muscular hypotonia, and coma. Death has been reported. No causal relationship between these effects observed in infants and Dicyclomine administration has been established. Dicyclomine HYDROCHLORIDE IS CONTRAINDICATED IN INFANTS LESS THAN 6 MONTHS OF AGE AND IN NURSING MOTHERS. (See CONTRAINDICATIONS and PRECAUTIONS: Nursing Mothers and Pediatric Use.)

Safety and efficacy of Dicyclomine hydrochloride in pediatric patients have not been established.



Use with caution in patients with:

  1. Autonomic neuropathy.
  2. Hepatic or renal disease.
  3. Ulcerative colitis - large doses may suppress intestinal motility to the point of producing a paralytic ileus and the use of this drug may precipitate or aggravate the serious complication of toxic megacolon. (See CONTRAINDICATIONS.)
  4. Hyperthyroidism.
  5. Hypertension.
  6. Coronary heart disease.
  7. Congestive heart failure.
  8. Cardiac tachyarrhythmia.
  9. Hiatal hernia. (See CONTRAINDICATIONS: Reflux esophagitis.)
  10. Known or suspected prostatic hypertrophy.

Investigate any tachycardia before administration of Dicyclomine hydrochloride since it may increase the heart rate.

With overdosage, a curare-like action may occur (i.e., neuromuscular blockade leading to muscular weakness and possible paralysis).

Information for Patients

Dicyclomine hydrochloride may produce drowsiness or blurred vision. The patient should be warned not to engage in activities requiring mental alertness, such as operating a motor vehicle or other machinery or to perform hazardous work while taking this drug.

Dicyclomine hydrochloride is contraindicated in infants less than 6 months of age and in nursing mothers. (See CONTRAINDICATIONS, WARNINGS, and PRECAUTIONS: Nursing Mothers and Pediatric Use.)

In the presence of a high environmental temperature, heat prostration can occur with drug use (fever and heat stroke due to decreased sweating). If symptoms occur, the drug should be discontinued and a physician contacted.

Drug Interactions

The following agents may increase certain actions or side effects of anticholinergic drugs: amantadine, antiarrhythmic agents of Class I (e.g., quinidine), antihistamines, antipsychotic agents (e.g., phenothiazines), benzodiazepines, MAO inhibitors, narcotic analgesics (e.g., meperidine), nitrates and nitrites, sympathomimetic agents, tricyclic antidepressants, and other drugs having anticholinergic activity.

Anticholinergics antagonize the effects of antiglaucoma agents. Anticholinergic drugs in the presence of increased intraocular pressure may be hazardous when taken concurrently with agents such as corticosteroids. (See also CONTRAINDICATIONS.)

Anticholinergic agents may affect gastrointestinal absorption of various drugs, such as slowly dissolving dosage forms of digoxin; increased serum digoxin concentrations may result. Anticholinergic drugs may antagonize the effects of drugs that alter gastrointestinal motility, such as metoclopramide. Because antacids may interfere with the absorption of anticholinergic agents, simultaneous use of these drugs should be avoided. The inhibiting effects of anticholinergic drugs on gastric hydrochloric acid secretion are antagonized by agents used to treat achlorhydria and those used to test gastric secretion.

Carcinogenesis, Mutagenesis, Impairment of Fertility

There are no known human data on long-term potential for carcinogenicity or mutagenicity.

Long-term studies in animals to determine carcinogenic potential are not known to have been conducted.

In studies in rats at doses of up to 100 mg/kg/day, Dicyclomine hydrochloride produced no deleterious effects on breeding, conception, or parturition.


Teratogenic Effects

Pregnancy Category B

Reproduction studies have been performed in rats and rabbits at doses up to 33 times the maximum recommended human dose based on 160 mg/day (3 mg/kg) and have revealed no evidence of impaired fertility or harm to the fetus due to Dicyclomine. Epidemiologic studies in pregnant women with products containing Dicyclomine hydrochloride (at doses up to 40 mg/day) have not shown that Dicyclomine increases the risk of fetal abnormalities if administered during the first trimester of pregnancy. There are, however, no adequate and well-controlled studies in pregnant women at the recommended doses (80 to 160 mg/day). Because animal reproduction studies are not always predictive of human response, Dicyclomine hydrochloride as indicated for functional bowel/irritable bowel syndrome should be used during pregnancy only if clearly needed.

Nursing Mothers

Since Dicyclomine hydrochloride has been reported to be excreted in human milk, Dicyclomine HYDROCHLORIDE IS CONTRAINDICATED IN NURSING MOTHERS. (See CONTRAINDICATIONS, WARNINGS, PRECAUTIONS: Pediatric Use and ADVERSE REACTIONS.)

Pediatric Use



Safety and effectiveness in pediatric patients have not been established.

Adverse Reactions

Controlled clinical trials have provided frequency information for reported adverse effects of Dicyclomine hydrochloride listed in a decreasing order of frequency. (See CLINICAL PHARMACOLOGY.)

Not all of the following adverse reactions have been reported with Dicyclomine hydrochloride. Adverse reactions are included here that have been reported for pharmacologically similar drugs with anticholinergic/antispasmodic action.

Gastrointestinal: dry mouth, nausea, vomiting, constipation, bloated feeling, abdominal pain, taste loss, anorexia.

Central Nervous System: dizziness, light-headedness, tingling, headache, drowsiness, weakness, nervousness, numbness, mental confusion and/or excitement (especially in elderly persons), dyskinesia, lethargy, syncope, speech disturbance, insomnia.

Ophthalmologic: blurred vision, diplopia, mydriasis, cycloplegia, increased ocular tension.

Dermatologic/Allergic: rash, urticaria, itching, and other dermal manifestations; severe allergic reaction or drug idiosyncrasies including anaphylaxis.

Genitourinary: urinary hesitancy, urinary retention.

Cardiovascular: tachycardia, palpitations.

Respiratory: dyspnea, apnea, asphyxia. (See WARNINGS.)

Other: decreased sweating, nasal stuffiness or congestion, sneezing, throat congestion, impotence, suppression of lactation. (See PRECAUTIONS: Nursing Mothers.)

Drug Abuse and Dependence

Abuse of and/or dependence on Dicyclomine for anticholinergic effects have been rarely reported.


Signs and Symptoms

The signs and symptoms of overdosage are headache; nausea; vomiting; blurred vision; dilated pupils; hot, dry skin; dizziness; dryness of the mouth; difficulty in swallowing; and CNS stimulation. A curare-like action may occur (i.e., neuromuscular blockade leading to muscular weakness and possible paralysis).

A 37-year old female reported numbness on the left side, cold fingertips, blurred vision, abdominal and flank pain, decreased appetite, dry mouth, and nervousness following ingestion of 320 mg daily (four 20 mg tablets QID) for four days. These events resolved after discontinuing the Dicyclomine.

Oral LD50

The acute oral LD50 of the drug is 625 mg/kg in mice.

Minimum Human Lethal Dose/Maximum Human Dose Recorded

The amount of drug in a single dose that is ordinarily associated with symptoms of overdosage or that is likely to be life-threatening, has not been defined. The maximum human oral dose recorded was 600 mg by mouth in a 10-month-old child and approximately 1500 mg in an adult, each of whom survived.

In three of the infants who died following administration of Dicyclomine hydrochloride (see WARNINGS), the blood concentrations of drug were 200, 220, and 505 ng/mL, respectively.


It is not known if Dicyclomine hydrochloride is dialyzable.


Treatment should consist of gastric lavage, emetics, and activated charcoal. Sedatives (e.g., short-acting barbiturates, benzodiazepines) may be used for management of overt signs of excitement. If indicated, an appropriate parenteral cholinergic agent may be used as an antidote.

Dicyclomine Dosage and Administration



The only oral dose clearly shown to be effective is 160 mg per day (in 4 equally divided doses). Since this dose is associated with a significant incidence of side effects, it is prudent to begin with 80 mg per day (in 4 equally divided doses). Depending upon the patient's response during the first week of therapy, the dose should be increased to 160 mg per day unless side effects limit dosage escalation.

If efficacy is not achieved within 2 weeks or side effects require doses below 80 mg per day, the drug should be discontinued. Documented safety data are not available for doses above 80 mg daily for periods longer than 2 weeks.

How is Dicyclomine Supplied

Dicyclomine Hydrochloride Capsules are provided containing 10 mg of Dicyclomine hydrochloride. The 10 mg capsule is a hard shelled gelatin capsule with a light turquoise blue opaque cap and a light turquoise blue body axially printed with MYLAN over 1610 in black ink both on the cap and the body. The capsule is filled with white to off-white powder. They are available as follows:

NDC 0378-1610-01
bottles of 100 capsules

NDC 0378-1610-05
bottles of 500 capsules


Dispense in a tight, light-resistant container as defined in the USP using a child-resistant closure.

Mylan Pharmaceuticals Inc.
Morgantown, WV 26505


Dicyclomine Hydrochloride (Dicyclomine Hydrochloride)
Product Code 0378-1610 Dosage Form CAPSULE
Route Of Administration ORAL DEA Schedule
Name (Active Moiety) Type Strength
Dicyclomine Hydrochloride (Dicyclomine) Active 10 MILLIGRAM  In 1 CAPSULE
anhydrous lactose Inactive  
colloidal silicon dioxide Inactive  
D&C yellow no. 10 aluminum lake Inactive  
FD&C blue #1 Inactive  
FD&C blue no. 1 aluminum lake Inactive  
FD&C blue no. 2 aluminum lake Inactive  
FD&C red no. 40 aluminum lake Inactive  
gelatin Inactive  
magnesium stearate Inactive  
microcrystalline cellulose Inactive  
n-Butyl alcohol Inactive  
pharmaceutical glaze (modified) in SD-45 Inactive  
pregelatinized (corn) starch Inactive  
propylene glycol Inactive  
SDA-3A alcohol Inactive  
sodium lauryl sulfate Inactive  
synthetic black iron oxide Inactive  
titanium dioxide Inactive  
Characteristic Appearance Characteristic Appearance
Color TURQUOISE (light turquoise blue opaque) , TURQUOISE ( light turquoise blue) Score 1
Shape CAPSULE Symbol false
Imprint Code MYLAN;1610 Coating false
Size 12mm
# NDC Package Description Multilevel Packaging
1 0378-1610-01 100 CAPSULE In 1 BOTTLE, PLASTIC None
2 0378-1610-05 500 CAPSULE In 1 BOTTLE, PLASTIC None

Revised: 08/2007

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