Table of Contents > Drug > Hyoscyamine Print



Related terms
Author information


    Related terms
    • U.S. Brand Names: Anaspaz®;HyoMax® -SR;HyoMaxT-DT;HyoMaxT-FT;Hyosyne;Levbid®;Levsin®;Levsin®/SL;Symax® DuoTab;Symax® FasTab;Symax® SL;Symax® SR
    • Canadian Brand Names: Levsin®
    • Pharmacologic Category: Anticholinergic Agent

    • This medicine is used to relieve motion sickness.
    • This medicine is used to slow the speed through the stomach and gastrointestinal tract.
    • This medicine is used to treat diarrhea.
    • This medicine is used to treat gastrointestinal ulcers.
    • This medicine is used to treat irritable bowel syndrome.
    • This medicine is used to treat muscle spasms of the gastrointestinal tract, gallbladder system, or urinary system.
    • This medicine is used to treat Parkinson's disease.
    • This medicine is used to treat side effects caused by mood-stabilizing medicine.
    • Hyoscyamine reduces acid secretion in the stomach.
    • It slows movement through the gastrointestinal tract and urinary tract, decreasing spasms.
    • It improves the chemical balance in the brain.


    How to take

    • Take this medicine with or without food. Take with food if it causes an upset stomach.
    • Drink plenty of noncaffeine-containing liquid unless told to drink less liquid by healthcare provider.
    • Long-acting products: Swallow whole. Do not chew, break, or crush.
    • Sublingual (under the tongue): Place under tongue and let dissolve. Do not swallow whole.
    • Oral-disintegrating tablet: Place on tongue and let dissolve. Do not swallow whole.
    • A liquid (elixir, solution) is available if you cannot swallow pills.
    • Those who have feeding tubes can also use the liquid. Flush the feeding tube before and after medicine is given.
    • If you are taking this medicine for irritable bowel syndrome or spasms of the gastrointestinal tract, take 30-60 minutes before meals.

    Missed Dose

    • Take a missed dose as soon as possible.
    • If it is almost time for the next dose, skip the missed dose and return to your regular schedule.
    • Do not take a double dose or extra doses.


    • Store at room temperature.
    • Protect capsules and tablets from moisture. Do not store in a bathroom or kitchen.



    • If you have an allergy to hyoscyamine or any other part of this medicine.
    • Tell healthcare provider if you are allergic to any medicine. Make sure to tell about the allergy and how it affected you. This includes telling about rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other symptoms involved.
    • If you have any of the following conditions: Bleeding problems, fast heartbeat, glaucoma, intestinal blockage, myasthenia gravis, slow-moving gastrointestinal tract, ulcerative colitis, or urinary tract blockage.


    • If you are 65 or older, use this medicine with caution. You could have more side effects.
    • If you are a male with problems urinating, talk with healthcare provider.
    • Check medicines with healthcare provider. This medicine may not mix well with other medicines.
    • If you have PKU, talk with healthcare provider. Some products do contain phenylalanine.
    • You may not be alert. Avoid driving, doing other tasks or activities until you see how this medicine affects you.
    • Avoid alcohol (includes wine, beer, and liquor) or other medicines and natural products that slow your actions and reactions.
    • You can get sunburned more easily. Avoid sun, sunlamps, and tanning beds. Use sunscreen; wear protective clothing and eyewear.
    • Be careful in hot weather. Drink plenty of fluids to prevent dehydration.
    • Tell healthcare provider if you are pregnant or plan on getting pregnant.
    • Tell healthcare provider if you are breast-feeding.

    Side Effects

    • Feeling lightheaded, sleepy, having blurred vision, or a change in thinking clearly. Avoid driving, doing other tasks or activities that require you to be alert or have clear vision until you see how this medicine affects you.
    • Constipation. More liquids, regular exercise, or a fiber-containing diet may help. Talk with healthcare provider about a stool softener or laxative.
    • Dry mouth. Frequent mouth care, sucking hard, sugar-free candy, or chewing sugar-free gum may help.


    • Change in condition being treated. Is it better, worse, or about the same?
    • Dry mouth may cause an increase in cavities. Take good care of your teeth. See a dentist regularly.
    • Follow up with healthcare provider.

    Contact a healthcare provider

    • If you suspect an overdose, call your local poison control center or emergency department immediately.
    • Signs of a life-threatening reaction. These include wheezing; chest tightness; fever; itching; bad cough; blue skin color; fits; or swelling of face, lips, tongue, or throat.
    • Severe dizziness or passing out.
    • Severe diarrhea, even after medicine is stopped.
    • Significant change in thinking clearly and logically.
    • Unable to pass urine.
    • Any rash.
    • No improvement in condition or feeling worse.

    General Statements

    • If you have a life-threatening allergy, wear allergy identification at all times.
    • Do not share your medicine with others and do not take anyone else's medicine.
    • Keep all medicine out of the reach of children and pets.
    • Most medicines can be thrown away in household trash after mixing with coffee grounds or kitty litter and sealing in a plastic bag.
    • In Canada return any unused drugs back to the pharmacy. Also, visit for more facts about the right way to get rid of unused drugs.
    • Keep a list of all your medicines (prescription, natural products, supplements, vitamins, over-the-counter) with you. Give this list to healthcare provider (doctor, nurse, nurse practitioner, pharmacist, physician assistant).
    • Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or in Canada to Health Canada's Canada Vigilance Program at 1-866-234-2345.
    • Talk with healthcare provider before starting any new medicine, including over-the-counter, natural products, or vitamins.

    Author information
    • Copyright © 1978-2010 Lexi-Comp Inc. All rights reserved.

    Copyright © 2011 Natural Standard (

    The information in this monograph is intended for informational purposes only, and is meant to help users better understand health concerns. Information is based on review of scientific research data, historical practice patterns, and clinical experience. This information should not be interpreted as specific medical advice. Users should consult with a qualified healthcare provider for specific questions regarding therapies, diagnosis and/or health conditions, prior to making therapeutic decisions.

    The Healthy Pharmacy health tools
    Sarasota, FL Natural Health Practitioners
    The Healthy Pharmacy
    Sarasota, FL 34240
    More Info