Bactrim (Trimethoprim)

Trimethoprim is used to treat ear infections, urinary tract infections, bronchitis, traveler's diarrhea, and Pneumocystis carinii pneumonia.

Dosage Quantity Price View
10 mg (EU2EU) 30
10 mg (EU2EU) 60
10 mg (EU2EU) 90
10 mg (EU2EU) 120
10 mg (EU2EU) 180

How is it used?

Bactrim is used to treat infections caused by certain bacteria. Bactrim is an antibiotic combination that contains a sulfonamide antibiotic. It works by killing sensitive bacteria.

For what conditions or diseases is this medicine prescribed?

Try the Antibacterial or for the Antibiotics

Bactrim is used to treat infections caused by certain bacteria. Bactrim is an antibiotic combination that contains a sulfonamide antibiotic. It works by killing sensitive bacteria.

DO NOT use Bactrim if:

  • are allergic to any ingredient in Bactrim or similar medications
  • have had a severe allergic reaction to any other sulfonamide (sulfa) medicine (eg, glipizide, hydrochlorothiazide)
  • are taking dofetilide
  • have anemia caused by low levels of folate in the blood or urinary blockage
  • are at or after 38 weeks pregnant (full term) or are breastfeeding
  • the patient is a child under 2 months
  • you are going to receive a live oral typhoid vaccine.

Contact your doctor or healthcare provider immediately if any of these apply to you.

Some medical conditions can interact with Bactrim. Tell your doctor or pharmacist if you have a medical condition, especially if any of the following apply to you:

  • if you are pregnant, planning to become pregnant, or are breastfeeding
  • if you are taking any prescription (especially anti-seizure) or over-the-counter medicine, an herbal preparation, or a dietary supplement
  • if you are allergic to medicines, foods or other substances
  • if you have liver or kidney problems, blood problems (for example anemia, porphyria), asthma or HIV infection
  • if you have severe allergies, glucose-6-phosphate dehydrogenase deficiency or an enzyme deficiency
  • if you are at risk of low folate levels in your blood (for example, if you suffer from alcoholism, if you are elderly, if you do not absorb nutrients from food properly, if you are in a poor nutritional state, if you are taking medicines for seizures).

Some medications can interact with Bactrim. Tell your doctor if you are taking any other medicines, especially any of the following:

  • Leucovorin because it may decrease the effectiveness of Bactrim
  • Angiotensin converting enzyme (ACE) inhibitors (eg, enalapril) or diuretics (eg, hydrochlorothiazide) because they may increase the risk of Bactrim side effects
  • Anticoagulants (eg warfarin) because it may increase the risk of bleeding
  • Dofetilide because it can increase the risk of serious heart problems
  • Digoxin, methotrexate, phenytoin, sulfones (eg, dapsone), or sulfonylureas (eg, glipizide) because the risk of their side effects may be increased with Bactrim
  • BCG vaccine or oral typhoid vaccine because its effectiveness may be diminished by Bactrim
  • Cyclosporine because its effectiveness may decrease and the risk of liver side effects may increase.

This may not be a complete list of all the interactions that can occur. Ask your doctor if Bactrim can interact with other medications that you take. Consult your doctor before starting, stopping, or changing the dose of any medicine.

Important safety information:

  • Bactrim can make you sunburn more easily. Avoid the sun, sunlamps, or tanning booths until you know how you react to Bactrim. Use sunscreen or wear protective clothing if you have to be outdoors for more than a time.
  • Mild diarrhea is common with the use of antibiotics. However, in rare cases a more serious form of diarrhea (pseudomembranous colitis) may occur. This can develop while you are using the antibiotic or in the months after you stop using it. Contact your doctor right away if you have stomach pain or cramps, severe diarrhea, or bloody stools. Do not treat diarrhea without first checking with your doctor.
  • Contact your doctor immediately if stomach pain or cramps, severe diarrhea or bloody stools occur during treatment or within several months after treatment with Bactrim. Do not treat diarrhea without first checking with your doctor.
  • Be sure to use Bactrim throughout your treatment. If you don't, the medicine may not clear the infection completely. The bacteria may also become less sensitive to this or other medications. This could make it difficult to treat the infection in the future.
  • Bactrim only works against bacteria; it does not treat viral infections (for example, the common cold).
  • Long-term or repeated use of Bactrim may cause a second infection. Tell your doctor if signs of a second infection appear. Your medicine may need to be changed to treat it.
  • Diabetes patients: Bactrim can affect your blood sugar level. Monitor blood sugar levels closely. Ask your doctor before changing the dose of your diabetes medicine.
  • Bactrim can interfere with certain laboratory tests. Make sure your doctor and the laboratory personnel know that you are taking Bactrim.
  • Laboratory tests, including complete blood cell counts and kidney function, may be done while you use Bactrim. These tests can be used to monitor your condition or to check for side effects. Make sure you keep all your medical and lab appointments.
  • Use Bactrim with caution in the elderly; they may be more sensitive to its effects, especially severe skin reactions, bone marrow suppression, or high blood potassium levels.
  • Bactrim should not be used in children younger than 2 months; safety and efficacy in these children has not been confirmed.
  • Pregnancy and breast-feeding: If you become pregnant, consult your doctor. You will need to discuss the benefits and risks of using Bactrim while you are pregnant. Do not use Bactrim if you are 38 weeks pregnant or later (at term). Bactrim is found in breast milk. Do not breastfeed while taking Bactrim.

Use Bactrim as directed in the package insert

How should this medicine be used?

Use Bactrim as directed by your doctor.

  • Take Bactrim by mouth with or without food.
  • Bactrim works best if it is taken at the same time each day.
  • Take Bactrim with a full glass of water (8 oz / 240 mL). It is recommended to drink more fluids while taking Bactrim. Consult your physician for instructions.
  • To get rid of the infection completely, take Bactrim for the entire treatment. Keep taking it even if you feel better in a few days.
  • If you miss a dose of Bactrim, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular schedule. Do not take 2 doses at the same time.

Ask your doctor any questions you have about the use of Bactrim.

What are the side effects that this medicine could cause?

Important safety information:

  • Bactrim can make you sunburn more easily. Avoid the sun, sunlamps, or tanning booths until you know how you react to Bactrim. Use sunscreen or wear protective clothing if you have to be outdoors for more than a time.
  • Mild diarrhea is common with the use of antibiotics. However, in rare cases a more serious form of diarrhea (pseudomembranous colitis) may occur. This can develop while you are using the antibiotic or in the months after you stop using it. Contact your doctor right away if you have stomach pain or cramps, severe diarrhea, or bloody stools. Do not treat diarrhea without first checking with your doctor.
  • Contact your doctor immediately if stomach pain or cramps, severe diarrhea or bloody stools occur during treatment or within several months after treatment with Bactrim. Do not treat diarrhea without first checking with your doctor.
  • Be sure to use Bactrim throughout your treatment. If you don't, the medicine may not clear the infection completely. The bacteria may also become less sensitive to this or other medications. This could make it difficult to treat the infection in the future.
  • Bactrim only works against bacteria; it does not treat viral infections (for example, the common cold).
  • Long-term or repeated use of Bactrim may cause a second infection. Tell your doctor if signs of a second infection appear. Your medicine may need to be changed to treat it.
  • Diabetes patients: Bactrim can affect your blood sugar level. Monitor blood sugar levels closely. Ask your doctor before changing the dose of your diabetes medicine.
  • Bactrim can interfere with certain laboratory tests. Make sure your doctor and the laboratory personnel know that you are taking Bactrim.
  • Laboratory tests, including complete blood cell counts and kidney function, may be done while you use Bactrim. These tests can be used to monitor your condition or to check for side effects. Make sure you keep all your medical and lab appointments.
  • Use Bactrim with caution in the elderly; they may be more sensitive to its effects, especially severe skin reactions, bone marrow suppression, or high blood potassium levels.
  • Bactrim should not be used in children younger than 2 months; safety and efficacy in these children has not been confirmed.
  • Pregnancy and breast-feeding: If you become pregnant, consult your doctor. You will need to discuss the benefits and risks of using Bactrim while you are pregnant. Do not use Bactrim if you are 38 weeks pregnant or later (at term). Bactrim is found in breast milk. Do not breastfeed while taking Bactrim.

How is Bactrim (Trimethoprim) stored?

Store Bactrim at room temperature, between 15 and 25 degrees C (59 and 77 degrees F). Store away from heat, moisture, and light. Store in an airtight container that is resistant to light. Do not store it in the bathroom. Keep Bactrim out of the reach of children and away from pets.

what should I do in case of an overdose?

Important safety information:

  • Bactrim can make you sunburn more easily. Avoid the sun, sunlamps, or tanning booths until you know how you react to Bactrim. Use sunscreen or wear protective clothing if you have to be outdoors for more than a time.
  • Mild diarrhea is common with the use of antibiotics. However, in rare cases a more serious form of diarrhea (pseudomembranous colitis) may occur. This can develop while you are using the antibiotic or in the months after you stop using it. Contact your doctor right away if you have stomach pain or cramps, severe diarrhea, or bloody stools. Do not treat diarrhea without first checking with your doctor.
  • Contact your doctor immediately if stomach pain or cramps, severe diarrhea or bloody stools occur during treatment or within several months after treatment with Bactrim. Do not treat diarrhea without first checking with your doctor.
  • Be sure to use Bactrim throughout your treatment. If you don't, the medicine may not clear the infection completely. The bacteria may also become less sensitive to this or other medications. This could make it difficult to treat the infection in the future.
  • Bactrim only works against bacteria; it does not treat viral infections (for example, the common cold).
  • Long-term or repeated use of Bactrim may cause a second infection. Tell your doctor if signs of a second infection appear. Your medicine may need to be changed to treat it.
  • Diabetes patients: Bactrim can affect your blood sugar level. Monitor blood sugar levels closely. Ask your doctor before changing the dose of your diabetes medicine.
  • Bactrim can interfere with certain laboratory tests. Make sure your doctor and the laboratory personnel know that you are taking Bactrim.
  • Laboratory tests, including complete blood cell counts and kidney function, may be done while you use Bactrim. These tests can be used to monitor your condition or to check for side effects. Make sure you keep all your medical and lab appointments.
  • Use Bactrim with caution in the elderly; they may be more sensitive to its effects, especially severe skin reactions, bone marrow suppression, or high blood potassium levels.
  • Bactrim should not be used in children younger than 2 months; safety and efficacy in these children has not been confirmed.
  • Pregnancy and breast-feeding: If you become pregnant, consult your doctor. You will need to discuss the benefits and risks of using Bactrim while you are pregnant. Do not use Bactrim if you are 38 weeks pregnant or later (at term). Bactrim is found in breast milk. Do not breastfeed while taking Bactrim.

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