Generic name: Hyoscyamine sulfate.

Other brand names: Anaspaz, Cystospaz, Cystospaz-M, Neoquess.

Levsin is an antispasmodic. It slows the action of the bowel and production of stomach acid, thereby relaxing the muscles and relieving spasms. 

Quick Facts About Levsin


Used to treat stomach, intestinal, and urinary tract disorders involving cramps, colic, or other painful muscle contractions. Also used before anesthesia to dry excess secretions or a runny nose. Also used to: control excess secretions and reduce pain in the case of pancreas inflammation; reduce muscle rigidity and tremors and control drooling and excess sweating in the case of Parkinson’s disease; and as preparation for certain diagnostic X-rays.

Levsin Dosage

Sublingual tablets may be dissolved under the tongue, chewed, or swallowed. Regular tablets can be dissolved under tongue or swallowed.

  • Usual adult dose (and children 12 years and older): Levsin/SL and Levsin Tablets — 1 to 2 tablets every 4 hours as needed; swallow or place under tongue; tablets may be chewed. Do not take more than 12 tablets in 24 hours. Levsin Elixir — 1 to 2 teaspoonfuls every 4 hours as needed, not to exceed 12 teaspoonfuls in 24 hours. Levsin Drops — 1 to 2 milliliters every 4 hours as needed, not to exceed 12 milliliters in 24 hours. Levsinex Timecaps — 1 to 2 Timecaps every 12 hours; doctor may adjust to 1 Timecap every 8 hours. Do not exceed more than 4 Timecaps in 24 hours.
  • Usual child dose: (children 2 to 12 years): Levsin and Levsin Tablets—1/2 to 1 tablet every 4 hours as needed; do not exceed 6 tablets in 24 hours. Levsin Elixir—1/4 to 1 teaspoonful every 4 hours as needed; do not exceed more than 6 teaspoonfuls in 24 hours. Levsin Drops— 1/4 to 1 milliliter every 4 hours as needed; do not exceed more than 6 milliliters in 24 hours. Children under 2 years — dosage determined by body weight. Levsinex Timecaps — 1 Timecap every 12 hours; do not exceed more than 2 Timecaps in 24 hours.
  • 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.

Levsin Side Effects

Overdose symptoms:

blurred vision, central nervous system stimulation, dilated pupils, dizziness, dry mouth, headache, hot and/or dry skin, nausea, swallowing difficulty, vomiting. If you suspect an overdose, immediately seek medical attention.

More common side effects: allergic reactions, bloating, blurred vision, confusion, constipation, decreased sweating, dilated pupils, dizziness, drowsiness, dry mouth, excitement, headache, hives, impotence, inability to urinate, insomnia, itching, heart palpitations, lack of coordination, loss of sense of taste, nausea, nervousness, rapid heartbeat, skin reactions, speech problems, vomiting, weakness.

No known less common or rare Levsin side effects.


Inform your doctor before combining Levsin with:

amantadine (Symmetrel); antidepressants such as Elavil, Nardil, Parnate, and Tofranil; antihistamines such as Benadryl; major tranquilizers such as Thorazine and Haldol; other antispasmodics such as Bentyl; potassium supplements such as Slow-K.

Avoid taking simultaneously with antacids; take Levsin 1 hour before or 2 hours after a meal.

Special Cautions

If pregnant or planning to become pregnant, inform your doctor immediately. Not known if Levsin appears in breast milk.

No special precautions apply to seniors.

Follow doctor’s instructions carefully for children.

  • Do not take if sensitive to or allergic to Levsin.
  • May cause dizziness, drowsiness, blurred vision, or impair your ability to drive a car or operate machinery. Do not take part in any activity that requires alertness.
  • Doctor should not prescribe this medication if you have: bowel or digestive tract obstruction or paralysis, diarrhea (especially if with an ileostomy or colostomy), glaucoma, myasthenia gravis, severe bowel inflammation, or urinary obstruction.
  • Avoid high temperatures such as sauna, very hot baths, or being outside on hot days; may be at risk for heatstroke when taking Levsin.
  • Use with caution if you have: congestive heart failure, heart disease, high blood pressure, irregular heartbeats, kidney disease, or overactive thyroid.
  • May experience: agitation, an exaggerated sense of well-being, coma, confusion, decreased anxiety, difficulty speaking, disorientation, fatigue, hallucinations, lack of coordination, short-term memory loss, sleeplessness — which should disappear 12 to 48 hours after you stop taking Levsin.


HealthSurvey.org 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 Levsin side effects, please contact your healthcare provider.