Bactrim F Generic Septrim 14 Tabs Trimethoprim / Sulfamethoxazole 160mg / 800mg Generic Septra

160mg / 800mg
In stock
Package Size: 14 Tabs
Spanish Name: Soltrim F/ Eutrim F
Substance: Trimethoprim/Sulfamethoxazole
Strength: 800mg
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Bactrim f, also known as Septrim and co-trimoxazole (Trimethoprim / Sulfamethoxazole), is a widely used antibiotic that is part of drug therapy for many bacterial infections. The drug is a combination of two active components: Trimethoprim and Sulfamethoxazole, in doses of 160 mg and 800 mg, respectively.

Application and mechanism of action

The use of Bactrim includes the treatment of infections such as genitourinary infections, bronchitis, otitis media and some types of diarrhea. The dosage of the drug is determined by the doctor and depends on the type of infection, its severity and the characteristics of the patient.

The mechanism of action of Bactrim f is to block two consecutive stages of biochemical processes in bacterial cells, which leads to disruption of the production of folic acid, which is necessary for the growth and reproduction of bacteria. This makes the drug effective against a wide range of microorganisms.

Bactrim otc

Bactrim f is available under different names in different countries. For example, it may be sold as Bactrim in Mexico and under other trade names in Australia. Despite this, its pharmacological action remains the same.

Bactrim pills are widely used due to their effectiveness and convenience of use. The cost of Bactrim can vary depending on the country of sale, local markups and the availability of generics.

It is important to note that in many countries, Bactrim is only available with a doctor's prescription, but in some regions it can be purchased without a prescription. Nevertheless, self-medication with antibiotics can lead to the development of bacterial resistance, so consultation with a specialist before starting the drug is recommended.

Buying Bactrim online has become possible thanks to the development of Internet pharmacies, which gives access to medicines even in remote regions. However, it is important to make sure that the source is reliable to avoid fakes.

Contraindications to the use of Bactrim f

  • Allergic Reactions: Patients with known hypersensitivity to trimethoprim, sulfamethoxazole or other sulfonamide drugs should not take Bactrim f.
  • Severe liver dysfunction: In cases of significant liver dysfunction, the use of Bactrim may not be safe.
  • Severe renal impairment: In patients with severe renal impairment, dose adjustment or the selection of an alternative drug may be necessary.
  • Megaloblastic anemia: Because trimethoprim and sulfamethoxazole affect folic acid synthesis, their use is contraindicated in megaloblastic anemia caused by folate deficiency.
  • Pregnancy and lactation: Bactrim f is contraindicated at the end of pregnancy and during lactation due to the risk of adverse effects on the fetus or newborn.

Side effects from the use of Bactrim f

Side effects may range from mild to serious and include the following:

  • Gastrointestinal disorders: Nausea, vomiting, diarrhea, and anorexia are the most common side effects and usually resolve after discontinuation of the drug.
  • Skin reactions: Rash, itching, and urticaria may occur in some patients. In rare cases, more serious skin reactions, such as Stevens-Johnson syndrome or toxic epidermal necrolysis may develop.
  • Blood changes: Bactrim f may cause leukopenia, thrombocytopenia, anemia, and other blood disorders. These effects are usually reversible after the discontinuation of treatment.
  • Hyperkalemia: Increased blood potassium levels may occur in some patients, especially in the elderly or in patients with impaired renal function.
  • Psychiatric Reactions: Dizziness, headache, insomnia and, rarely, psychotic reactions such as hallucinations and depression may occur during treatment with Bactrim f.


  • Drugs affecting folic acid levels: Bactrim f, by inhibiting the synthesis of folic acid in bacteria, may increase the effects of drugs that also affect its metabolism in humans, such as methotrexate. This can lead to an increased risk of toxic effects, such as myelosuppression.

  • Drugs that affect potassium levels: Bactrim may cause an increase in blood potassium levels, so taking it together with potassium-saving diuretics, angiotensin-converting enzyme (ACE) inhibitors, angiotensin receptor blockers (ARBs), and other drugs that can increase potassium levels requires caution and regular blood potassium monitoring.

  • Anticoagulants: Co-administration of Bactrim with warfarin and other anticoagulants may increase their anticoagulant effects, increasing the risk of bleeding. This is due to the effect of Bactrim on the metabolism of warfarin in the liver and a decrease in the synthesis of vitamin K-dependent clotting factors. Thus, when using these drugs together, it is necessary to carefully monitor blood coagulation parameters and, if necessary, adjust the dose of anticoagulant.

  • Drugs metabolized by the liver: Bactrim may affect the liver enzymes involved in the metabolism of other medicines. This may lead to an increase or decrease in their effect. An example of such interaction is phenytoin, the concentration of which in the blood may increase when co-administered with Bactrim f, which increases the risk of toxic effects, including neurological disorders. For this reason, when concomitant administration of Bactrim f and phenytoin occurs, regular monitoring of phenytoin levels in the blood and the clinical condition of the patient is necessary.

  • Hypoglycemic agents: Bactrim may increase the effects of oral hypoglycemic agents (e.g., sulfonylurea), which leads to an increased risk of hypoglycemia. Concomitant use of Bactrim f with oral hypoglycemic agents requires careful monitoring of blood glucose levels and adjustment of the dose of the hypoglycemic agent if necessary.

  • Diuretics: Co-administration of Bactrim f with thiazide diuretics in elderly patients may increase the risk of thrombocytopenia with or without purpura. Patients taking both of these drugs should have their clinical blood counts closely monitored.

  • Cyclosporine: Increased serum creatinine levels have been observed in renal transplant patients receiving Bactrim f and cyclosporine concomitantly, indicating an effect on renal function. This requires close monitoring of renal function and possibly adjustment of the cyclosporine dose.

  • Interaction with HIV drugs: In patients taking HIV drugs such as protease inhibitors and nucleoside reverse transcriptase analogs, dose adjustment may be required when co-administered with Bactrim, especially in the presence of side effects such as increased potassium levels or changes in blood counts.


  • Genitourinary infections: For the treatment of uncomplicated urinary tract infections in adults, 160 mg trimethoprim/800 mg sulfamethoxazole twice daily for 10 days is often recommended. For children, the dose is usually calculated based on their weight.

  • Acute and chronic bronchitis: For acute bronchitis in adults, the dosage is 160 mg trimethoprim/800 mg sulfamethoxazole twice daily for 5 days. Chronic bronchitis may require longer courses of treatment, up to 14 days, with the same dosage.

  • Pneumocystis pneumonia (PCP): For the treatment and prevention of PCP in adults and children, the dose is calculated based on body weight. It is usually 15-20 mg of trimethoprim and 75–100 mg of sulfamethoxazole per kg of body weight per day, divided into 3–4 doses, for 14–21 days.

  • Shigellosis: For infections caused by bacteria of the genus Shigella, adults and children over 12 years of age are prescribed 160 mg trimethoprim/800 mg sulfamethoxazole twice daily for 5 days.

  • Severe infections: For severe infections (e.g., severe pneumonia or sepsis), adults may be prescribed an increased dose up to 320 mg trimethoprim/1600 mg sulfamethoxazole twice daily.

  • Prevention of infections: Bactrim f may also be used to prevent certain infections, for example, in patients with weakened immune systems. In such cases, the dosage is usually lower than for the treatment of active infections and is calculated individually.

The duration of action of the drug depends on the specific medical case and usually ranges from 5 to 14 days. In some cases, such as in the treatment of chronic or recurrent infections, the course of therapy can be prolonged on the recommendation of the doctor.

To summarize, Bactrim f is a powerful tool in the fight against bacterial infections, but its use requires care and adherence to medical recommendations. Given the potential side effects and interactions with other drugs, its administration should be carried out under the strict control of a specialist. With the spread of antibiotic resistance, the judicious use of drugs such as Bactrim becomes a key aspect in ensuring their long-term efficacy.

Package Size
14 Tabs
Spanish Name
Soltrim F/ Eutrim F
ReviewsBactrim F Generic Septrim 14 Tabs Trimethoprim / Sulfamethoxazole 160mg / 800mg Generic Septra

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