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Trimethoprim FAQ


What is Trimethoprim used for?

Trimethoprim is used to treat urinary tract infections, ear infections, acute exacerbations of chronic bronchitis in adults, and Pneumocystis jiroveci pneumonia.

How does Trimethoprim work?

Trimethoprim works by stopping the growth of bacteria.

Can I buy Trimethoprim without a prescription?

No, Trimethoprim is a prescription medication and should only be used under the guidance of a healthcare professional.

What are the common side effects of Trimethoprim?

Common side effects may include nausea, vomiting, diarrhea, and loss of appetite. Contact your doctor if you experience severe or persistent side effects.

Is Trimethoprim effective for viral infections?

No, Trimethoprim only treats bacterial infections and is not effective against viral infections such as the common cold.

Can Trimethoprim be used during pregnancy?

It is important to consult with a healthcare professional before using Trimethoprim during pregnancy or while breastfeeding.

How should Trimethoprim be stored?

Store Trimethoprim at room temperature away from light and moisture. Do not store in the bathroom.

What should I do if I miss a dose of Trimethoprim?

If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.

What should I avoid while taking Trimethoprim?

Avoid prolonged sun exposure, tanning booths, and sunlamps. Use sunscreen and wear protective clothing when outdoors.

Can Trimethoprim cause allergic reactions?

Allergic reactions to Trimethoprim are rare, but seek immediate medical attention if you notice any symptoms of a serious allergic reaction, such as rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, or trouble breathing.

Are there any food or drinks I should avoid while taking Trimethoprim?

There are no specific foods or drinks that need to be avoided while taking Trimethoprim. However, it's important to stay well-hydrated and maintain a balanced diet for overall health.

How long does it take for Trimethoprim to work?

Symptoms should improve within a few days of starting Trimethoprim. However, it's crucial to complete the full course of treatment as prescribed by your doctor.

Can Trimethoprim be used to treat children?

Trimethoprim can be used to treat certain infections in children. However, the dosage and duration of treatment should be determined by a pediatrician.

Can I drink alcohol while taking Trimethoprim?

It is generally safe to have moderate alcohol consumption while taking Trimethoprim. However, it is recommended to consult with your doctor to ensure it does not interfere with your treatment.

What tests or precautions should be taken before starting Trimethoprim?

Your healthcare provider may perform tests to determine the type of infection and the most suitable antibiotic treatment. It's essential to inform your doctor about any medical conditions, allergies, or medications you are currently taking.

Is Trimethoprim the same as sulfamethoxazole?

Trimethoprim and sulfamethoxazole are often used together to treat certain infections. Trimethoprim is an antibiotic, while sulfamethoxazole is a sulfonamide antibiotic. They work synergistically to combat a wider range of bacterial infections.

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Information provided by Dr. Nithya Priya Raju. Reviewed by Dr. Mohamed El Khouly