Medical Editor: John P. Cunha, DO, FACOEP Last updated on RxList: 3/15/2023

What is Cantil and how is it used?

Cantil is a prescription medicine used to treat the symptoms of Peptic Ulcers and Irritable Bowel Syndrome. Cantil may be used alone or with other medications.

Cantil belongs to a class of drugs called Synthetic Anticholinergics, Antispasmodics.

It is not known if Cantil is safe and effective in children.

What are the possible side effects of Cantil?

Cantil may cause serious side effects including:

  • hives,
  • difficulty breathing,
  • swelling of your face, lips, tongue, or throat,
  • mental or mood changes,
  • eye pain or pressure,
  • fast or pounding heartbeat,
  • difficulty urination,
  • decreased sexual ability,
  • rash,
  • itching, and
  • severe dizziness

Get medical help right away, if you have any of the symptoms listed above.

The most common side effects of Cantil include:

  • dry mouth,
  • decreased sweating,
  • dizziness,
  • drowsiness,
  • blurred vision,
  • widened pupils,
  • nausea,
  • vomiting, and
  • constipation  

Tell the doctor if you have any side effect that bothers you or that does not go away.

These are not all the possible side effects of Cantil. For more information, ask your doctor or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


CANTIL tablets for oral administration contain 25 mg mepenzolate bromide USP. The anticholinergic agent mepenzolate bromide USP chemically is 3-[(hydroxydiphenylacetyl)oxy]-1,1- dimethylpiperidinium bromide and has the following structure:

CANTIL® (mepenzolate bromide) Structural Formula Illustration

Mepenzolate bromide occurs as a white or light cream-colored powder, which is freely soluble in methanol, slightly soluble in water and chloroform, and practically insoluble in ether.

Each yellow tablet contains 25 mg mepenzolate bromide USP. This tablet also contains inactive ingredients: confectioners' sugar, corn starch, corn syrup solids, FD&C Yellow No. 5 (tartrazine), (see PRECAUTIONS, General), lactose, magnesium stearate and microcrystalline cellulose.