Propantheline reduces the secretions of certain organs in the body, such as the stomach.

Propantheline is used to reduce stomach acid in people with stomach ulcers.

Propantheline may also be used for other purposes not listed in this medication guide.

You should not take this medication if you are allergic to propantheline, or if you have glaucoma, myasthenia gravis, a blockage in your stomach or intestines, severe ulcerative colitis, an enlarged prostate, or if you are unable to urinate.

Before taking propantheline, tell your doctor if you have heart disease, congestive heart failure, a heart rhythm disorder, high blood pressure, hiatal hernia, GERD, liver disease, or thyroid problems. .

Before using propantheline, tell your doctor if you regularly use other medicines that make you sleepy (such as cold or allergy medicine, sedatives, narcotic pain medicine, sleeping pills, muscle relaxers, and medicine for seizures, depression, or anxiety). They can add to sleepiness caused by propantheline.

Propantheline slows the digestive tract, which can make it harder for your body to absorb any medicines you take by mouth. Tell your doctor if any of your oral medications do not seem to work as well while you are using propantheline.

There are many other medicines that can interact with propantheline. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors.

Propantheline can cause side effects that may impair your vision, thinking, or reactions. Be careful if you drive or do anything that requires you to be alert and able to see clearly.

Avoid drinking alcohol. It can increase some of the side effects of propantheline.

Avoid becoming overheated or dehydrated during exercise and in hot weather. Propantheline can decrease perspiration and you may be more prone to heat stroke.

You should not take this medication if you are allergic to propantheline, or if you have:

• a blockage in your stomach or intestines;

• a bladder obstruction or if you are unable to urinate;

• severe ulcerative colitis or toxic megacolon;

• glaucoma; or

• myasthenia gravis.

If you have any of these other conditions, you may need a dose adjustment or special tests to safely use this medication:

• heart disease, congestive heart failure, or a heart rhythm disorder;

• high blood pressure;

• hiatal hernia or reflux esophagitis (GERD);

• liver disease;

• kidney disease;

• thyroid problems; or

• enlarged prostate.

FDA pregnancy category C. It is not known whether this medication is harmful to an unborn baby. Before using propantheline, tell your doctor if you are pregnant or plan to become pregnant during treatment.

It is not known whether propantheline passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

Older adults may be more sensitive to the side effects of propantheline.