Bactrim Forte (Co-trimoxazole): Uses, Safety and Interactions

What this tablet contains

Bactrim Forte is an oral antibiotic combination containing sulfamethoxazole 800 mg and trimethoprim 160 mg per tablet. The Turkish manufacturer document confirms this composition. The English safety discussion also uses UK information for co-trimoxazole at the same strength; product appearance, licensing and pack instructions can differ between countries. It should not be confused with lower-strength tablets or paediatric liquid.

When it is used

The cited product information includes treatment or prevention of Pneumocystis jirovecii pneumonia, toxoplasmosis and treatment of nocardiosis. Certain urinary, ear and respiratory infections are additional uses when organisms are susceptible and there is a good reason to prefer the combination. It is not a treatment for ordinary viral colds. The diagnosis and local resistance pattern matter more than a familiar brand name. A previous prescription does not establish that a new infection needs the same antibiotic.

Important safety issues

Nausea, diarrhoea and rash can occur. A spreading rash with blisters, mouth sores or fever, new breathing difficulty, unexplained bruising or jaundice requires urgent medical attention. Rare reactions can affect the skin, lungs, liver or blood cells. Previous serious reactions to trimethoprim or sulfonamides, kidney or liver impairment and folate-related blood problems must be discussed before treatment. A history of G6PD deficiency also needs assessment because haemolysis can occur. The reviewed UK label contraindicates use in the first trimester of pregnancy; later pregnancy and breastfeeding also need an individual assessment.

Interactions to check

Warfarin, phenytoin and methotrexate require particular attention because clinically important effects can increase. Potassium may rise when co-trimoxazole is combined with medicines such as spironolactone, ACE inhibitors or angiotensin-receptor blockers. Diabetes medicines may need closer glucose monitoring. These examples do not replace checking the full prescription, non-prescription and supplement list. A clinician may arrange blood counts, kidney-function tests or potassium measurements according to the person and treatment course; do not create a monitoring or dosing schedule from this overview.

Sources

• DEVA: Bactrim Forte 800 mg/160 mg tablets — Turkish product information — Manufacturer Turkish product information; current PDF checked 30 October 2026
• Aspen: Co-trimoxazole 160 mg/800 mg Forte tablets — UK SmPC — Text revised January 2026; emc updated 26 March 2026
• Co-trimoxazole Forte tablets — UK patient leaflet — Patient leaflet available on emc; checked 30 October 2026

Source check: 30 October 2026. This records a source check, not a clinical review by a doctor or pharmacist. Follow the leaflet for the exact product supplied to you.