Do not take this medication with any of the following:
-Certain medications for HIV, such as atazanavir, cobicistat, darunavir
-Voriconazole
This medication may also interact with the following:
-Certain medications that treat or prevent blood clots, such as warfarin

They need to know if you have any of these conditions:
-Constipation
-Diarrhea
-Glaucoma
-Heart disease
-Hiatal hernia and esophogeal reflux or GERD
-Kidney disease
-Liver disease
-Myasthenia gravis
-Porphyria
-Prostate trouble
-Stomach problems
-Substance use disorder
-Ulcerative colitis
-An unusual or allergic reaction to phenobarbital, hyoscyamine, atropine, scopolamine, other medications, foods, dyes, or preservatives
-Pregnant or trying to get pregnant
-Breast-feeding

Your mouth may get dry. Chewing sugarless gum or sucking hard candy, and drinking plenty of water may help. Contact your care team if the problem does not go away or is severe.
This medication may cause serious skin reactions. They can happen weeks to months after starting the medication. Contact your care team right away if you notice fevers or flu-like symptoms with a rash. The rash may be red or purple and then turn into blisters or peeling of the skin. Or, you might notice a red rash with swelling of the face, lips or lymph nodes in your neck or under your arms.
This medication may cause dry eyes and blurred vision. If you wear contact lenses, you may feel some discomfort. Lubricating drops may help. See your care team if the problem does not go away or is severe.
You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medication affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol may interfere with the effect of this medication. Avoid alcoholic drinks.
Estrogen and/or progestin hormones may not work as well while you are taking this medication. A barrier contraceptive, such as a condom or diaphragm, is recommended if you are using these hormones for contraception. Talk to your care team about other forms of contraception.
Avoid extreme heat (e.g., hot tubs, saunas). This medication can cause you to sweat less than normal. Your body temperature could increase to dangerous levels, which may lead to heat stroke.

Keep out of the reach of children and pets. This medication can be abused. Keep your medication in a safe place to protect it from theft. Do not share this medication with anyone. Selling or giving away this medication is dangerous and against the law.
This medication may cause accidental overdose and death if taken by other adults, children, or pets. Mix any unused medication with a substance like cat litter or coffee grounds. Then throw the medication away in a sealed container like a sealed bag or a coffee can with a lid. Do not use the medication after the expiration date.
Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F). Keep container tightly closed. Protect from light.