Generic Name: Methenamine

  • What is Hiprex?

    Hiprex is an antibiotic used to treat or prevent urinary tract infections when long-term treatment is required.

  • What is the most important information I should know about Hiprex?

    Take Hiprex as prescribed by your doctor for the full course of treatment, even if symptoms improve earlier. Do not skip doses. Skipping doses or not completing the full course of Hiprex can decrease its effectiveness, and can lead to growth of bacteria that are resistant to the effects of Hiprex.

    If you take doses larger than those recommended by your doctor, Hiprex can cause bladder irritation, painful and frequent urination, or the presence of protein or blood in your urine.

  • Who should not take Hiprex?

    Do not take Hiprex if you are allergic to it or any of its ingredients, if you have kidney or severe liver problems, or are severely dehydrated. Do not take it with antibiotics known as sulfonamides (such as sulfamethoxazole/trimethoprim).

  • What should I tell my doctor before I take the first dose of Hiprex?

    Tell your doctor about all prescription, over-the-counter, and herbal medications you are taking before beginning treatment with Hiprex. Also, talk to your doctor about your complete medical history, especially if you have severe dehydration, liver or kidney problems, are pregnant, plan to become pregnant, or are breastfeeding.

  • What is the usual dosage?

    The information below is based on the dosage guidelines your doctor uses. Depending on your condition and medical history, your doctor may prescribe a different regimen. Do not change the dosage or stop taking your medication without your doctor's approval.

    Adults and children >12 years: The usual dose is 1 tablet twice a day.

    Children 6-12 years: The usual dose is 1/2-1 tablet twice a day.

  • How should I take Hiprex?

    Take Hiprex exactly as prescribed by your doctor.

  • What should I avoid while taking Hiprex?

    If you eat certain foods that make your urine less acidic, Hiprex might not work as well. Talk with your doctor about which foods to avoid while you are taking this medication.

  • What are possible food and drug interactions associated with Hiprex?

    If Hiprex is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Hiprex with antibiotics known as sulfonamides.

  • What are the possible side effects of Hiprex?

    Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking this drug.

    Side effects include: nausea, pain while urinating, rash, upset stomach, vomiting

  • Can I receive Hiprex if I am pregnant or breastfeeding?

    The effects of Hiprex during pregnancy and breastfeeding are unknown. Tell your doctor immediately if you are pregnant, plan to become pregnant, or are breastfeeding.

  • What should I do if I miss a dose of Hiprex?

    If you miss a dose of Hiprex, take it as soon as you remember. However, if it is almost time for your next dose, skip the one you missed and return to your regular dosing schedule. Do not take two doses at once.

  • How should I store Hiprex?

    Store at room temperature.