Generic name: Dicyclomine hydrochloride.

Other brand names: Bemote, Byclomine, Di-Spaz.

Bentyl is an antispasmodic. It slows bowel action and reduces stomach acid.

Quick Facts About Bentyl


Used to treat irritable bowel syndrome.

Bentyl Dosage

Take exactly as prescribed.

  • Usual adult dose: 160 milligrams per day divided into equal doses. Doctor may start with 80 milligrams per day divided into 4 equal doses to decrease side effects. If not effective in 2 weeks, or lower than 80 milligrams is indicated, doctor may not continue therapy.
  • Usual child dose: not generally prescribed for children.
  • Missed dose: take as soon as possible, unless almost time for next dose. In that case, do not take missed dose; go back to regular schedule. Do not double doses.

Bentyl Side Effects

Overdose symptoms:

blurred vision, central nervous system (brain and spinal cord) stimulation, difficulty in swallowing, dilated pupils, dizziness, dryness of the mouth, headache, hot or dry skin, nausea, nerve blockage causing weakness and possible paralysis, vomiting. If you suspect an overdose, immediately seek medical attention.

More common side effects: blurred vision, dizziness, drowsiness, dry mouth, light-headedness, nausea, nervousness, weakness.

Less common Bentyl side effects: abdominal pain, agitation, bloated feeling, coma, confusion or excitement, constipation, decreased anxiety, decreased sweating, difficulty in carrying out voluntary movements, difficulty urinating, disorientation, double vision, enlargement of the pupil of the eye, exaggerated feeling of well-being, eye paralysis, fainting, fast or fluttery heartbeat, fatigue, hallucinations, headache, hives, impotence, inability to fall or stay asleep, inability to urinate, itching, labored or difficult breathing, lack of coordination, lack or loss of appetite, nasal stuffiness or congestion, numbness, rapid heartbeat, rash, severe allergic reaction, short-term memory loss, sluggishness, sneezing, speech disturbance, suffocation, suppression of breast milk, taste loss, temporary cessation of breathing, throat congestion, tingling, vomiting.


Inform your doctor before combining Bentyl with:

Amantadine (the Parkinson’s disease drug Symmetrel); antacids such as Maalox; anti-arrhythmic drugs such as Quinidine (Quinidex); antiglaucoma drugs such as Pilocarpine; antihistamines such as Tavist; benzodiazepine tranquilizers such as Valium and Xanax; corticosteroids (Prednisone); Digoxin (Lanoxin); MAO inhibitors (antidepressants such as Nardil); Metoclopramide (gastrointestinal stimulant Reglan); narcotic analgesics (Demerol); nitrates and nitrites (heart medications such as Nitroglycerin); phenothiazines (antipsychotic drugs such as Proventil and Ventolin); sympathomimetic airway-opening drugs such as Elavil and Tofranil.

No known food/other substance interactions.

Special Cautions

If pregnant or planning to become pregnant, inform your doctor immediately. Appears in breast milk; could affect a nursing infant.

No special precautions apply to seniors.

Not generally prescribed for children.

  • Do not take if you have: blockage of urinary tract, stomach, or intestines; glaucoma; myasthenia gravis; reflux esophagitis; severe ulcerative colitis.
  • May cause drowsiness or blurred vision and impair your ability to drive a car or operate machinery. Do not take part in any activity that requires alertness.
  • Fever and heat stroke due to decreased sweating can occur when Bentyl is used in hot weather.
  • If diarrhea occurs, notify your doctor, especially if you have had bowel removals, an ileostomy or colostomy.
  • Notify your doctor if you have: autonomic neuropathy, congestive heart failure, coronary heart disease, hiatal hernia, high blood pressure, hyperthyroidism, known or suspected enlargement of the prostate, liver or kidney disease, rapid or irregular heartbeat.

Note: provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Bentyl side effects, please contact your healthcare provider.