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Trimethoprim belongs to the group of medications called antibiotics. It is used to treat Urinary Tract Infections caused by certain types of bacteria.
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Trimethoprim belongs to the group of medications called antibiotics. It is used to treat Urinary Tract Infections caused by certain types of bacteria. Trimethoprim works by killing the bacteria that cause the infection.
Trimethoprim may be available under multiple brand names and/or in several different forms. Any specific brand name of Trimethoprim may not be available in all of the forms or approved for all of the conditions discussed here. As well, some forms of Trimethoprim may not be used for all of the conditions discussed here.
Your doctor may have suggested Trimethoprim for conditions other than those listed in these drug information articles. If you have not discussed this with your doctor or are not sure why you are taking Trimethoprim, speak to your doctor. Do not stop taking Trimethoprim without consulting your doctor.
Do not give Trimethoprim to anyone else, even if they have the same symptoms as you do. It can be harmful for people to take Trimethoprim if their doctor has not prescribed it.
The recommended adult dose of trimethoprim is 100 mg twice daily (every 12 hours) or 200 mg once daily (every 24 hours) for 10 days.
Many things can affect the dose of medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.
Trimethoprim should be taken with food.
Finish all of Trimethoprim, even if you start to feel better. This will reduce the likelihood of the infection returning.
It is important to take Trimethoprim exactly as prescribed by your doctor. If you miss a dose, take it as soon as possible and continue with your regular schedule. If it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice.
Store Trimethoprim at room temperature, protect it from light, and keep it out of the reach of children.
Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.
Many medications can cause side effects. A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent.
The side effects listed below are not experienced by everyone who takes Trimethoprim. If you are concerned about side effects, discuss the risks and benefits of Trimethoprim with your doctor.
The following side effects have been reported by at least 1% of people taking Trimethoprim. Many of these side effects can be managed, and some may go away on their own over time.
Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects.
Although most of the side effects listed below don't happen very often, they could lead to serious problems if you do not seek medical attention.
Check with your doctor as soon as possible if any of the following side effects occur:
Stop taking the medication and seek immediate medical attention if any of the following occur:
Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking Trimethoprim.
Each white, round, biconvex tablet bisected and engraved "TRI" over "100" on one side contains 100 mg of trimethoprim. Nonmedicinal ingredients: colloidal silicon dioxide, croscarmellose sodium, magnesium stearate, and methylcellulose.
Each yellow, round, biconvex tablet bisected and engraved "TRI" over "200" on one side contains 200 mg of trimethoprim. Nonmedicinal ingredients: colloidal silicon dioxide, croscarmellose sodium, magnesium stearate, methylcellulose, and D&C Yellow No. 10 Aluminum Lake 16%.
Do not take Trimethoprim if you:
There may be an interaction between trimethoprim and any of the following:
If you are taking any of these medications, speak with your doctor or pharmacist. Depending on your specific circumstances, your doctor may want you to:
An interaction between two medications does not always mean that you must stop taking one of them. Speak to your doctor about how any drug interactions are being managed or should be managed.
Medications other than those listed above may interact with Trimethoprim. Tell your doctor or prescriber about all prescription, over-the-counter (non-prescription), and herbal medications you are taking. Also tell them about any supplements you take. Since caffeine, alcohol, the Nicotine from cigarettes, or street drugs can affect the action of many medications, you should let your prescriber know if you use them.
Before you begin using a medication, be sure to inform your doctor of any medical conditions or Allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use Trimethoprim.
Blood disorders: The presence of sore throat, fever, pale skin, rash, or jaundice (yellowing of the skin) may be early signs of rare but serious blood disorders. If you develop any of these symptoms after starting trimethoprim, contact your doctor as soon as possible.
Folic acid levels: Trimethoprim affects how the body uses folic acid, a nutrient necessary for the formation of red blood cells. If you have a folic acid deficiency, discuss with your doctor how Trimethoprim may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Trimethoprim, and whether any special monitoring is needed.
Kidney function: Kidney Disease or reduced kidney function may cause Trimethoprim to build up in the body, causing side effects. If you have reduced kidney function or kidney disease, discuss with your doctor how Trimethoprim may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Trimethoprim, and whether any special monitoring is needed.
Liver function: Liver disease or reduced liver function may cause Trimethoprim to build up in the body, causing side effects. If you have reduced liver function or liver disease, discuss with your doctor how Trimethoprim may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Trimethoprim, and whether any special monitoring is needed.
Pregnancy: When trimethoprim is taken during pregnancy, it crosses the placenta and may affect the unborn baby. Trimethoprim should not be used during pregnancy unless the benefits outweigh the risks. If you become pregnant while taking Trimethoprim, contact your doctor immediately.
Breast-feeding: Trimethoprim passes into breast milk. If you are a breast-feeding mother and are taking trimethoprim, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.
Children: The safety and effectiveness of using trimethoprim for infants younger than 2 months of age have not been established. The effectiveness of using trimethoprim alone (i.e., not in combination with other antibiotics) has not been established for children under 12 years of age.
All material © 1996-2021 MediResource Inc. Terms and conditions of use. The contents herein are for informational purposes only. Always seek the advice of your physician or other qualified health providers with any questions you may have regarding a medical condition.
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