Bactrim vs sulfatrim?

Short answer: Bactrim and Sulfatrim are the same medicine. They are both fixed-dose combinations of trimethoprim and sulfamethoxazole (TMP-SMX). The difference is mainly brand name and tablet strength.

Key points to know
- Brand vs generic: Bactrim is a brand name; Sulfatrim is another brand name for the same TMP-SMX combination. Generics with the same strengths are usually available as well.
- Strengths (common):
- Regular strength tablets: TMP 80 mg + SMX 400 mg per tablet (often written as 80/400).
- Double-strength (DS) tablets: TMP 160 mg + SMX 800 mg per tablet (often written as 160/800).
- Doses may also come as oral suspension with similar 5:1 SMX:TMP ratio.
- How it’s used: Indications include uncomplicated urinary tract infections, sinusitis, otitis media, bronchitis, certain kinds of diarrhea, and Pneumocystis jirovecii pneumonia (PCP) prophylaxis/tromptment in certain patients. Dosing and duration depend on the infection and patient factors.
- Important safety and interactions:
- Contraindications/allergies to sulfa drugs.
- Avoid in late pregnancy and in newborns less than about 2 months old due to risk of kernicterus; use only if clearly needed and advised by a clinician.
- Can cause allergic/rash reactions (including potentially serious reactions like Stevens–Johnson syndrome).
- Can cause kidney problems, electrolyte changes (notably hyperkalemia), and liver issues in some people.
- Interactions: increases effect of warfarin, can interact with methotrexate, certain diabetes meds, and others. Use with potassium-sparing diuretics or ACE inhibitors requires caution.

If you want, tell me:
- Which infection you’re treating (or the exact dosing you were given),
- Whether you have pregnancy, kidney, or liver concerns,
- The exact tablet strength you’re looking at (80/400 vs 160/800, DS vs regular).

I can tailor dosing ranges, safety tips, and monitoring reminders to your situation.