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Brand & Generic Names


Basic Information

  • Habit forming? No
  • Prescription needed? Yes
  • Available as generic? No
  • Drug class: Antibacterial, antiurolithic


  • Treatment for chronic urinary tract infections.
  • Prevents formation of urinary tract stones. Will not dissolve stones already present.

Dosage & Usage Information

How to take:
Tablet--Swallow with liquid. If you can't swallow whole, crumble tablet and take with liquid or food.

When to take:
At the same time each day, according to instructions on prescription label.

If you forget a dose:
Take as soon as you remember up to 2 hours late. If more than 2 hours, wait for next scheduled dose (don't double this dose).

What drug does:
Stops enzyme action that makes urine too alkaline. Alkaline urine favors bacterial growth and stone formation and growth.

Time lapse before drug works:
1 to 3 weeks.

Don't take with:
Alcohol or iron.
Any other medicine without consulting your doctor or pharmacist.


Loss of appetite, tremor, nausea, vomiting.


    Overdose unlikely to threaten life. If person takes much larger amount than prescribed, call doctor, poison-control center or hospital emergency room for instructions.

Possible Adverse Reactions or Side Effects


    In case of overdose, see Overdose section.


  • Appetite loss, nausea, vomiting.
  • Anxiety, depression, mild headache, unusual tiredness.


  • Loss of coordination, slurred speech, severe headache, sudden change in vision, shortness of breath, clot or pain over a blood vessel, sudden chest pain, leg pain in calf (deep vein blood clot).
  • Rash on arms and face.


  • Sore throat, fever, unusual bleeding, bruising.
  • Hair loss.

Warnings & Precautions

Don't take if:
You have severe chronic kidney disease.

Before you start, consult your doctor:

  • If you are anemic.
  • If you have or have had phlebitis or thrombophlebitis.

Over age 60:
Adverse reactions and side effects may be more frequent and severe than in younger persons.

Studies inconclusive on harm to unborn child. Animal studies show fetal abnormalities. Decide with your doctor whether drug benefits justify risk to unborn child.

No proven problems. Avoid if possible.

Infants & children:
Not recommended. Safety and dosage have not been established.

Prolonged use:
Talk to your doctor about the need for follow-up medical examinations or laboratory studies to check blood pressure, liver function, kidney function, urinary pH.

Skin & sunlight:
No problems expected.

Driving, piloting or hazardous work:
Don't drive or pilot aircraft until you learn how medicine affects you. Don't work around dangerous machinery. Don't climb ladders or work in high places. Danger increases if you drink alcohol or take medicine affecting alertness and reflexes, such as antihistamines, tranquilizers, sedatives, pain medicines, narcotics and mind-altering drugs.

Don't discontinue without consulting doctor. Dose may require gradual reduction if you have taken drug for a long time. Doses of other drugs may also require adjustment.

No problems expected.

Possible Interaction with Other Drugs

------------------------ -----------------------
Dapsone Increased risk of adverse effect on
blood cells.
Iron Decreased effects of both drugs.

Possible Interaction with Other Substances

--------------- ---------------
Alcohol: Severe skin rash common in many
patients within 30 to 45 minutes
after drinking alcohol.
Beverages: None expected.
Cocaine: None expected.
Foods: None expected.
Marijuana: None expected.
Tobacco: None expected.

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