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Bactrim (sulfamethoxazole)

Bactrim is a type of drug that is formed with a combination of trimethoprim and sulfamethoxazole. Both of them are antibiotics that are used for treating different bacterial infections. They are used for treating urinary tract and ear infections, traveler’s diarrhoea, pneumocystis jiroveci pneumonia, shigellosis, and bronchitis. There are other purposes of this drug which may not be listed here.

Bactrim (sulfamethoxazole) tablets


The dosage of Bactrim (sulfamethoxazole/trimethoprim) can vary depending on the specific infection being treated, the severity of the condition, and individual factors such as age, weight, and kidney function. It is important to follow the instructions provided by your healthcare professional or the prescribing information on the medication label. The following are general dosage guidelines for adults:

Urinary Tract Infections:

Respiratory Tract Infections:

Skin and Soft Tissue Infections:

It is important to note that these are general guidelines, and your healthcare professional may adjust the dosage based on your specific condition. Always take the prescribed dosage and complete the full course of treatment, even if you start feeling better.

If you have any questions or concerns about the dosage of Bactrim, it is best to consult your healthcare professional or pharmacist for personalized advice. They can provide you with the most accurate and up-to-date information based on your individual circumstances.


The drug Bactrim is a combination drug of two antibiotics called trimethoprim and sulfamethoxazole. It is an antibacterial synthetic product that is available in DS (double strength) tablets. The inactive ingredients present in Bactrim are:


This medication is mainly used for the treatment of a large variety of infections caused by bacteria (like urine, middle ear, intestinal, and respiratory infections). It is also used for the prevention and treatment of a type of pneumonia (pneumocystis-type).

Bactrim shouldn’t be prescribed to children under 2 months of age as the might cause some serious effects on their health. This medication works only for certain infections. They do not cure viral infections (like flue and common cold). Misuse and unnecessary usage of this drug can reduce its effectiveness.


There are many side-effects associated with the use of Bactrim that may require medical attention. Some of these side-effects are mentioned below:

Bactrim is a combination drug of two antibiotics called trimethoprim and sulfamethoxazole


If the patient has any of the following conditions, he/she should not be allowed to use this medication:

Bactrim and pregnancy

This drug is not recommended to pregnant women as it has the potential of embryo/fetal developmental toxicity. It even inhibits folate metabolism. Therefore, care must be taken while prescribing Bactrim to a pregnant woman.

Some frequently asked questions about Sulfamethoxazole

What is Sulfamethoxazole?

Sulfamethoxazole is a combination antibiotic medication that contains sulfamethoxazole and trimethoprim. It is used to treat various bacterial infections, including urinary tract infections, respiratory tract infections, and skin and soft tissue infections.

How does Sulfamethoxazole work?

Sulfamethoxazole works by inhibiting the growth of bacteria. Sulfamethoxazole, a sulfonamide antibiotic, interferes with the production of folic acid in bacteria, while trimethoprim inhibits a specific enzyme involved in the folic acid synthesis pathway. Together, they synergistically target different steps of bacterial folic acid production, effectively killing the bacteria causing the infection.

What types of infections are treated with Sulfamethoxazole?

Sulfamethoxazole is commonly used to treat urinary tract infections, such as bladder infections. It is also effective against respiratory tract infections, including bronchitis and pneumonia. Additionally, Sulfamethoxazole can be used to treat skin and soft tissue infections caused by susceptible bacteria.

What is the usual dosage of Sulfamethoxazole?

The dosage of Sulfamethoxazole can vary depending on the type and severity of the infection. The usual adult dosage for most infections is one Sulfamethoxazole DS tablet or two regular-strength Sulfamethoxazole tablets taken every 12 hours. However, it is important to follow the specific dosage instructions provided by your healthcare professional.

What are the common side effects of Sulfamethoxazole?

Common side effects of Sulfamethoxazole may include nausea, vomiting, diarrhea, loss of appetite, and skin rash. In rare cases, more severe side effects such as allergic reactions or blood disorders may occur. If you experience any concerning symptoms, it is important to seek medical attention.

Can Sulfamethoxazole interact with other medications?

Sulfamethoxazole may interact with certain medications, including blood thinners, diuretics, and medications that affect kidney function. It is important to inform your healthcare professional about all the medications you are taking to avoid potential interactions.

Can anyone take Sulfamethoxazole?

Sulfamethoxazole may not be suitable for everyone. It is important to inform your healthcare professional about your complete medical history, including any allergies, kidney or liver problems, or blood disorders. They will determine if Sulfamethoxazole is appropriate for you and adjust the dosage if needed.

Remember, the information provided here is for general knowledge and should not replace medical advice. It is always best to consult with a healthcare professional for personalized guidance regarding your specific situation and the use of Sulfamethoxazole.

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