Sulfamethoxazole + Trimethoprim (Bactrim)
$0.34
Bactrim combines Sulfamethoxazole and Trimethoprim to treat urinary, chest, ear and gut infections caused by bacteria.
Drug Information
9 reviews for Sulfamethoxazole + Trimethoprim (Bactrim)
Bactrim is an antibiotic that contains two medicines: sulfamethoxazole and trimethoprim (together often called co-trimoxazole). The two work as a team against many bacteria.
It is used for urinary, chest, ear and gut infections, and to treat and prevent a type of pneumonia that affects people with weak immune systems.
What is it used for?
- Urinary tract infections
- Some chest and ear infections
- Travellers' diarrhoea and some other gut infections
- Treating and preventing Pneumocystis pneumonia (PCP)
How does it work?
Bacteria need a vitamin called folic acid to grow. Sulfamethoxazole and trimethoprim block two different steps in how bacteria make folic acid, which stops them growing.
This information is written in simple words to help you understand this product. It does not replace advice from your doctor or pharmacist.
Read these points before you start. If any of them apply to you, talk to your doctor or pharmacist first.
- Do not take it if you have ever had an allergic reaction to this antibiotic or to a similar one.
- Antibiotics only work on infections caused by bacteria. They do not help colds, flu or most sore throats, which are caused by viruses.
- Take the whole course your doctor gives you, even if you feel better after a few days. Stopping early can let the infection come back and make germs harder to treat in the future.
- Tell your doctor if you are pregnant, trying for a baby or breastfeeding.
- Never share your antibiotics or keep leftovers for another time.
- Do not take it if you are allergic to "sulfa" medicines (sulfonamides).
- Tell your doctor if you have kidney or liver problems, low folic acid, a blood disorder, G6PD deficiency or porphyria.
- It can raise potassium levels in the blood. Tell your doctor if you take potassium tablets, certain water tablets or ACE inhibitor blood pressure medicines.
- It can make warfarin, methotrexate, phenytoin and some diabetes tablets stronger. Your doctor may need to check you more closely.
- It can make your skin burn more easily in the sun.
- Tell your doctor or pharmacist about every other medicine, vitamin or herbal product you use.
- Keep this product out of the reach and sight of children.
Like all medicines, Bactrim can cause side effects, but not everybody gets them.
Common side effects
- Feeling sick (nausea) or being sick
- Diarrhoea or loose stools
- Stomach ache or indigestion
These are usually mild and often get better as your body gets used to it. Tell your doctor if they bother you or do not go away.
Stop using it and get medical help straight away if you notice:
- Severe diarrhoea that is watery or has blood in it, even up to 2 months after you finish the medicine
- Signs of an allergic reaction, such as a rash, swelling of the face, lips or tongue, wheezing or trouble breathing
- A skin rash that blisters or peels, with fever and sore mouth or eyes
- Unusual bruising or bleeding, sore throat with fever, or looking very pale (possible blood problems)
- Yellowing of the skin or eyes
This is not a complete list. If you notice anything unusual, ask your doctor or pharmacist.
- Take it twice a day, about 12 hours apart.
- Swallow the tablet with a full glass of water. You can take it with or without food.
- Drink plenty of water every day while you take it. This helps protect your kidneys.
- A common adult dose is one double-strength tablet (960 mg) twice a day, or two regular tablets (480 mg) twice a day, for 3 to 14 days.
If you miss a dose: Take it as soon as you remember. If it is nearly time for your next dose, skip the missed one and carry on as normal. Never take two doses at once to make up.
If you use too much: Contact your doctor, a poison control centre or your local emergency number straight away, even if you feel fine. Take the pack with you.
How to store it: Keep it in its original pack at room temperature (below 25°C / 77°F), away from heat, damp and direct sunlight. Do not use it after the expiry date.
- QWhy should I drink lots of water with Bactrim?
- A
It helps stop tiny crystals forming in your urine, which can hurt the kidneys.
- QWhat is a sulfa allergy?
- A
It is an allergy to sulfonamide antibiotics like sulfamethoxazole. If you have had a rash or reaction to one before, tell your doctor and do not take this medicine.
- QHow quickly does Bactrim work for a bladder infection?
- A
Many people feel better within 1 to 3 days. Finish the course anyway.

Hassan Dubois –
My Bactrim order went through without a hitch. Communication was good throughout the order. Nothing was broken or leaking and the box was in good shape. The website was easy to use and I found what I needed quickly.
Joseph Hassan –
I was a bit unsure at first, but ordering here worked out fine. It was cheaper than my usual place, and the service was just as good. The courier delivered it safely and on schedule. Thank you, I will be ordering again.
Vikram Park –
I found Bactrim on this site pretty quickly. Adding it to the cart and paying was quick. I think the pricing is fair for what you get. Good service, will reorder when I need to.
Yang Colombo –
My experience with this order was good. No surprise fees at checkout, which I appreciated. Everything I received was exactly what I ordered. Packaging was clean and professional.
Amelie Horvat –
I placed my first order here and it went smoothly. No confusing steps, just a simple checkout. Also, the cost was clearly shown before I paid, so no nasty surprises. Very satisfied with how it all went.
Nadia Mensah –
I have ordered from here before and it went well again. Payment went through smoothly on the first try. I compared a few sites and this one had the better price. Shipping was prompt and I got tracking updates along the way. I would recommend this site to friends and family.
Meera Mendoza –
My order went through without any problems. I was able to order from my phone without any trouble. No complaints about the product. The seals were intact and everything looked fresh. Would happily recommend it.
Lin Mohamed –
Ordering from this site was easy. The parcel looked untouched when it got to me. It was what I expected when I opened it. I am satisfied and will come back for my next order.
Katarina Torres –
Picked up my Bactrim from this site and I am glad I did. No damage anywhere, the packaging did its job. It was dispatched fast and reached me soon after.