What should I tell my care team before I take this medication?
They need to know if you have any of these conditions:
-Bladder or prostate problems or trouble passing urine
-Glaucoma
-Heart disease
-Myasthenia gravis
-Stomach problems
-An unusual or allergic reaction to hyoscyamine; methenamine; methylene blue; phenyl salicylate; sodium biphosphate, other medications, foods, dyes, or preservatives
-Pregnant or trying to get pregnant
-Breast-feeding
What may interact with this medication?
-Antacids
-Atropine
-Antihistamines
-Certain antibiotics, such as sulfacetamide or sulfamethoxazole
-Certain medications for bladder problems, such as oxybutynin or tolterodine
-Certain medications for blood pressure, such as hydrochlorothiazide
-Certain medications for stomach problems, such as dicyclomine or hyoscyamine
-Certain medications for travel sickness, such as scopolamine
-Certain medications for Parkinson disease, such as benztropine or trihexyphenidyl
-Ipratropium
-Ketoconazole
-MAOIs, such as Carbex, Eldepryl, Marplan, Nardil, and Parnate
-Opioids
This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.
What should I watch for while using this medication?
Tell your care team if your symptoms do not start to get better or if they get worse.
This medication may affect your coordination, reaction time, or judgment. Do not drive or operate machinery until you know how this medication affects you. Sit up or stand slowly to reduce the risk of dizzy or fainting spells. Drinking alcohol with this medication can increase the risk of these side effects.
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.
You will need to be on a special diet while taking this medication. Ask your care team how many glasses of water or other fluids to drink each day. Also, ask which foods to include and which to avoid to help keep your urine acidic. Your urine must be acidic for this medication to work.
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 eye care team if the problem does not go away or is severe.