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
- Dehydration
- Glaucoma
- Heart disease
- High blood pressure
- High levels of phosphate in the blood
- High levels of sodium in the blood
- Kidney disease
- Liver disease
- Myasthenia gravis
- Sodium (salt) restricted diet
- Stomach problems
- An unusual or allergic reaction to methenamine, sodium acid phosphate, methylene blue, hyoscyamine, other medications, foods, dyes, or preservatives
- Pregnant or trying to get pregnant
- Breast-feeding
What may interact with this medication?
This medication may interact with the following:
- Antacids
- Antihistamines for allergy, cough and cold
- Atropine
- Certain antibiotics, such as sulfacetamide, sulfamethoxazole
- Certain medications for bladder problems, such as oxybutynin, tolterodine
- Certain medications for blood pressure, such as hydrochlorothiazide
- Certain medications for depression, anxiety, or mental health conditions
- Certain medications for Parkinson disease, such as benztropine, trihexyphenidyl
- Certain medications for stomach problems, such as dicyclomine, hyoscyamine
- Certain medications for travel sickness, such as scopolamine
- Ipratropium
- Ketoconazole
- MAOIs, such as Carbex, Eldepryl, Marplan, Nardil, and Parnate
- Opioid medications for pain
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 judgement. 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 may need to be on a special diet while taking this medication. Ask your care team how many glasses of fluids you need 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.