Cotri – Antibiotic for Bacterial Infections
What it fights Cotri is a double-barrel antibiotic that packs Sulfamethoxazole and Trimethoprim together to knock out bacterial infections. Pakistani doctors hand this out for all sorts of nasty bugs that antibiotics can handle:
- Chest infections like bronchitis and pneumonia when you’re coughing up green junk
- UTIs – those painful urinary tract infections that make you feel like you’re peeing fire
- Stomach bugs including traveler’s diarrhea and certain types of dysentery that leave you glued to the toilet
- Ear, nose, and throat infections that won’t quit
- Skin infections and soft tissue problems that are getting worse
The two medicines team up to stop bacteria from multiplying, so your body can actually fight off the infection.
What’s in it
- The heavy hitters: Sulfamethoxazole and Trimethoprim
- What they do: One’s a sulfonamide antibiotic, the other blocks stuff bacteria need to survive
- How you take it: Pills or liquid syrup
Critical warnings Don’t mess around with this – only use it exactly like your doctor told you. Finish the whole course even when you start feeling better, or the infection can come back stronger and harder to kill. Babies under 2 months shouldn’t get this unless their doctor really thinks it’s necessary.
If you’ve got kidney problems, liver issues, low folic acid, or blood disorders, your doctor needs to watch you extra carefully. Drink lots of water while you’re on this to keep your kidneys happy. Pregnant women and nursing mothers need to check with their doctor first.
This stuff can mess with other medicines like blood thinners and water pills, so tell your doctor about everything else you’re taking.
What you might deal with Antibiotics always come with baggage. You might get:
- Feeling sick to your stomach, throwing up, or getting diarrhea
- Not wanting to eat anything or general stomach upset
- Breaking out in a rash or getting itchy
- Headaches or feeling dizzy
Scary stuff that’s rare but serious: bad allergic reactions, your blood counts dropping, or severe skin reactions. If you can’t breathe, get a rash that won’t go away, or start bleeding or bruising weird, get to a hospital now.
Reviewed by Dr. Imran Shah, Consultant Infectious Disease Specialist
Cotri is an antibiotic often used for urinary tract and respiratory infections. It usually works well, but only if the full course is completed—stopping early can make the infection come back stronger. Side effects are generally mild, though patients with other health problems may need closer monitoring.
Disclaimer: This information is for awareness only. Always consult your doctor before starting or stopping antibiotics.

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