Aisha S.
13 May 2026
Works as expected. The bank-transfer payment felt a bit old-fashioned compared to card checkout, but delivery was smooth.
Antibiotics
Bactrim DS
Double-strength sulfamethoxazole + trimethoprim in one tablet — a combination antibiotic taken as a short, twice-daily course.
Active: Sulfamethoxazole + Trimethoprim4 pack sizesAntibioticsIn stock
Generic Sulfamethoxazole + Trimethoprim — Bactrim DS. Available in multiple pack sizes.
Price range
$57.18–$245.04
From $2.86 per unit · 4 pack sizes available · Active ingredient: Sulfamethoxazole + Trimethoprim
Dispatched within 24 hours of payment
Pack size & pricing
4 pack sizes
- Dispatched in 24h · delivered in 3–5 business days
- Discreet, plain packaging — free delivery over $150
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About Bactrim DS
Bactrim DS is a generic medication in our antibiotics catalogue. Available in 4 pack sizes for bulk-pricing savings. Active ingredient: Sulfamethoxazole + Trimethoprim. Always read the patient information leaflet before use and consult a doctor or pharmacist if you have any underlying conditions or take other medications.
Why choose Bactrim DS?
- Contains Sulfamethoxazole + Trimethoprim — the same active ingredient used in the branded equivalent, manufactured under GMP conditions.
- 4 pack sizes to choose from, with a lower per-unit price on the larger packs.
- Plain, unbranded packaging — nothing on the outside indicates the contents.
- Delivered Australia-wide, usually within 2–4 business days.
Part of our Antibiotics range.
At a glance
- Active ingredient
- Sulfamethoxazole + Trimethoprim
- Treatment area
- Antibiotics
- Pack sizes
- 4 options
- From
- $57.18 per pack
- Delivery
- Australia-wide · 2–4 days
- Quality & packaging
- GMP-grade · batch & expiry printed on pack
Pack sizes & pricing
The larger the pack, the lower the price per unit.
| Pack size | Per unit | Price |
|---|---|---|
| 20 pills | $2.86 | $57.18 |
| 30 pills | $2.78 | $83.31 |
| 50 pills | $2.61 | $130.69 |
| 100 pills | $2.45 | $245.04 |
Delivery & discreet packaging
- Australia-wide delivery in 2–4 business days. Free on orders over $150.00, otherwise $12.00 standard.
- Dispatched within one business day of payment clearing, with a confirmation email.
- Plain, unbranded outer packaging — nothing on the outside indicates the contents.
- GST included at checkout — no surprise bills on arrival.
Before you buy Bactrim DS
- Read the patient information leaflet supplied with the product in full before first use.
- Tell your doctor or pharmacist about any existing health conditions and other medicines you take, so they can check it is suitable for you.
- Do not exceed the dose described in the leaflet, and never take more than one medicine for the same purpose at the same time.
- Buy from a reputable source and check the packaging and leaflet are intact on arrival.
- Keep all medicines out of the sight and reach of children.
What is Bactrim DS and who typically chooses it?
Bactrim DS combines two antibiotics — sulfamethoxazole and trimethoprim — in a single double-strength (DS) tablet. The pairing blocks two consecutive steps in bacterial folate production, which is why the combination works against organisms that resist either ingredient alone. Doctors commonly turn to it for urinary tract infections, certain respiratory and skin infections, and travellers' diarrhoea when the bacteria are known to be susceptible. It is also a standard choice for people allergic to penicillins, since it belongs to a completely different drug class from Amoxicillin 500mg. Bactrim DS should only be used for a doctor-confirmed bacterial infection — it does nothing against viruses such as colds or flu.
How long does Bactrim DS take to work?
Most people notice symptoms easing within 48 to 72 hours of starting Bactrim DS, though this varies by infection type and severity. Feeling better early is not a reason to stop: courses described in the leaflet typically run several days to two weeks depending on what is being treated, and stopping early lets surviving bacteria regrow — sometimes with resistance. Each dose maintains antibacterial levels for roughly half a day, which is why the leaflet describes twice-daily dosing at evenly spaced intervals. If symptoms have not improved after three days, or worsen at any point, contact a doctor rather than extending the course yourself.
Bactrim DS vs amoxicillin — which antibiotic should you choose?
This is not a strength ladder — Bactrim DS and amoxicillin are different drug classes for different situations, and the right one depends on the infection and your allergy history. Amoxicillin, available here as Amoxicillin 250mg, Amoxicillin 500mg, Amoxicillin 650mg and Amoxicillin 1000mg, is a penicillin often preferred for ear, throat, dental and chest infections. Bactrim DS is frequently chosen for urinary infections and for penicillin-allergic patients. It is not suitable if you are allergic to sulfa drugs. Because the choice is diagnosis-driven, a doctor or pharmacist should confirm which one fits your infection before you order.
How do you get the best results from Bactrim DS?
Follow the patient leaflet exactly and complete the full course, even once you feel well — unfinished antibiotic courses are a major driver of resistance. Drink plenty of water throughout treatment; the sulfamethoxazole component can crystallise in concentrated urine, and good hydration prevents this. Space doses evenly and take them at the same times each day. Sulfa antibiotics can increase sun sensitivity, so use sunscreen and avoid sunbeds during the course. Tell your doctor about all other medicines, particularly blood thinners, methotrexate, diuretics and potassium-affecting drugs, which interact with trimethoprim. Bactrim DS is not appropriate in late pregnancy or with significant kidney disease — check first. Our amoxicillin uses and safety guide covers antibiotic basics that apply here too.
Why buy Bactrim DS from Kamagra AUS?
Every box of Bactrim DS we ship is a sealed, GMP-manufactured product with the batch number and expiry date printed on the blister and carton, plus the full patient information leaflet inside. We verify each order over WhatsApp before dispatch so you can confirm exactly what you are receiving and ask questions first. Parcels travel in plain, unbranded packaging with nothing on the outside indicating the contents. Delivery across Australia takes 2–4 business days and is free on orders over $150. Packs start at 20 tablets for $66.98, rising to 100 tablets for $294.05 — but order only what a sensible course requires, and involve a doctor in the decision.
What are the side effects of Bactrim DS?
Bactrim DS (sulfamethoxazole + trimethoprim) is generally well tolerated, but like every antibiotic it can cause side effects. The most common are nausea, vomiting, loss of appetite, mild diarrhoea and skin rash. Some people notice headache or increased sensitivity to sunlight, so use sun protection during a course. Rare but serious reactions need urgent attention: a spreading blistering rash or peeling skin (possible Stevens-Johnson syndrome), unexplained bruising or bleeding, severe watery or bloody diarrhoea, yellowing of the skin or eyes, or signs of high potassium such as muscle weakness and irregular heartbeat — stop the tablets and seek medical help immediately. Side effects become more likely at higher doses and with longer courses, which is why you should never extend a course on your own.
Who should not take Bactrim DS?
Do not take Bactrim DS if you are allergic to sulfamethoxazole, trimethoprim or any other sulfonamide (sulfa) medicine — sulfa allergy is common and reactions can be severe. It is also unsuitable for people with serious liver damage, severe kidney impairment that is not being monitored, certain blood disorders such as megaloblastic anaemia caused by folate deficiency, and in late pregnancy or while breastfeeding a newborn. Tell a doctor first if you take warfarin, methotrexate, ACE inhibitors or potassium-sparing diuretics (risk of high potassium), phenytoin, or diabetes medicines like glibenclamide, because Bactrim DS interacts with all of these. Elderly patients and anyone with G6PD deficiency should only use it under medical supervision.
How should you store Bactrim DS and check it's genuine?
Keep Bactrim DS in its original blister strip, in a cool, dry place below 25°C, away from direct sunlight and bathroom humidity. Do not pop tablets out in advance — the foil protects them from moisture. Always store medicines out of sight and reach of children. To check your pack is genuine: the blister should be fully sealed with no lifted foil, each strip should carry a printed batch number and expiry date that match the outer carton, the box should arrive intact and uncrushed, and a patient information leaflet should be included. If anything looks tampered with, do not take the tablets — contact us first.
Is Bactrim DS good value? Price per tablet explained
Bactrim DS pricing on Kamagra AUS is straightforward: 20 pills cost $66.98, which works out to roughly $3.35 per tablet. Choosing the 100-pill pack at $294.05 brings that down to about $2.86 per tablet — a saving of around 12% per dose. The 30-pill ($98.02) and 50-pill ($155.19) packs sit in between at about $3.27 and $3.10 respectively. Orders over $150 ship free, so the 50 and 100 packs also avoid delivery charges. Only order what a prescriber has actually recommended, though — antibiotics should be bought for a defined course, not stockpiled indefinitely.
About Sulfamethoxazole + Trimethoprim
General information about the active ingredient in Bactrim DS.
See the full Sulfamethoxazole + Trimethoprim guide & all Sulfamethoxazole + Trimethoprim productsWhat is Sulfamethoxazole + Trimethoprim?
Sulfamethoxazole with trimethoprim, often called co-trimoxazole (and known by brand names such as Bactrim), is a combination antibiotic that pairs two active ingredients in a fixed ratio. It is prescribed for certain bacterial infections, including some urinary tract infections and particular chest infections, and has an established role in preventing and treating a type of pneumonia (Pneumocystis pneumonia) in vulnerable people. It is effective only against susceptible bacteria, not viruses.
How it works
The two ingredients act on the same bacterial pathway at different steps. Bacteria need to make folic acid (folate) to build DNA and multiply. Sulfamethoxazole blocks an early step in folate production, while trimethoprim blocks a later step. By interrupting the pathway at two points, the combination has a stronger effect on susceptible bacteria than either drug alone. Human cells obtain folate from the diet and do not rely on this pathway, allowing the medicine to act more selectively.
How to take it
Take co-trimoxazole exactly as prescribed and read the patient information leaflet carefully. It comes as tablets and an oral liquid. It is generally recommended to take it with a meal or snack and to drink plenty of fluids during treatment to help protect the kidneys. Take doses at evenly spaced times and complete the full course even if you feel better, to help fully clear the infection and limit antibiotic resistance.
Side effects
Common (usually mild and temporary):
- Nausea or vomiting
- Diarrhoea
- Loss of appetite
- Skin rash or itching
- Headache
- Sore or inflamed mouth or tongue
Stop and seek medical help if you experience:
- Signs of a severe allergic reaction such as swelling of the face, lips, tongue or throat, breathing difficulty, or collapse — seek emergency care
- Severe, blistering or peeling skin rashes, or sores in the mouth, eyes or genitals — stop and get urgent help
- Signs of a blood disorder such as unexplained bruising or bleeding, persistent sore throat, high fever or extreme tiredness
- Yellowing of the skin or eyes, severe stomach pain, or other signs of liver problems
- Severe or persistent watery or bloody diarrhoea during or after treatment
Safety & who should not take it
- Tell your doctor if you are allergic to sulfonamide (sulfa) medicines, trimethoprim or other antibiotics, as serious allergic reactions can occur.
- Inform your doctor of any kidney or liver problems, blood disorders, folate deficiency, asthma, or a deficiency of the enzyme G6PD before starting.
- Generally avoided in pregnancy and in very young infants; tell your doctor if you are pregnant, planning a pregnancy or breastfeeding.
- List all other medicines, as co-trimoxazole interacts with several drugs, including some blood thinners, diabetes medicines and water tablets (diuretics).
- Drink plenty of fluids during treatment and tell your doctor if you produce much less urine than usual.
- Use only for the infection it was prescribed for, and never share it, to help limit antibiotic resistance.
- Return any unused or out-of-date medicine to a pharmacy for safe disposal.
Storage
Store in the original packaging below 25°C, protected from light and moisture, out of the sight and reach of children. Follow any specific shelf-life instructions for the oral liquid. Do not use after the expiry date.
Frequently asked questions
Why is co-trimoxazole two medicines in one?+
Combining sulfamethoxazole and trimethoprim blocks the same bacterial folate pathway at two separate steps, giving a stronger effect against susceptible bacteria than either ingredient alone.
Why should I drink plenty of water with it?+
Drinking adequate fluids helps keep urine flowing and supports the kidneys during treatment. Your doctor or pharmacist can advise how much is appropriate for you.
Can I stop taking it once I feel better?+
No. Finish the full course as prescribed, even if symptoms improve, to help clear the infection completely and reduce the risk of antibiotic resistance.
Important: This information is general and not a substitute for medical advice. Always read the patient information leaflet supplied with your medicine and consult a doctor or pharmacist before use — especially if you have existing health conditions or take other medication.
Common questions about Bactrim DS
How much does Bactrim DS cost?+
Bactrim DS starts from $57.18. Several pack sizes are available — the larger the pack, the lower the per-unit price. Delivery is free on orders over $150, otherwise $12 standard (2–4 business days).
How is Bactrim DS delivered across Australia?+
Orders ship in plain, unbranded packaging from our Australian fulfilment centre, usually within one business day of payment clearing. Standard delivery takes 2–4 business days Australia-wide; express delivery is also available. All prices include GST, so there are no surprise bills on arrival.
What is the active ingredient in Bactrim DS?+
The active ingredient in Bactrim DS is Sulfamethoxazole + Trimethoprim — the same molecule used in the branded equivalent, manufactured under GMP conditions. Always read the patient information leaflet and consult a doctor or pharmacist before first use.
How do I pay for Bactrim DS?+
Choose your method at checkout: secure bank transfer, PayID, credit/debit card, or PayPal. You'll receive clear payment instructions by email, and we dispatch within one business day of payment clearing.
Is Bactrim DS discreetly packaged?+
Yes. Every order ships in plain, unbranded outer packaging — nothing on the outside indicates the contents or the pharmacy.
What does the DS in Bactrim DS mean?+
DS stands for double strength. A Bactrim DS tablet contains 800mg sulfamethoxazole and 160mg trimethoprim — twice the amount in a regular-strength Bactrim tablet. This lets many adult regimens work with one tablet per dose instead of two. Confirm with a doctor that the DS strength matches the regimen intended for your infection.
Can I take Bactrim DS if I'm allergic to penicillin?+
Usually yes — Bactrim DS contains no penicillin, and doctors often select it specifically for penicillin-allergic patients. However, it must not be taken if you are allergic to sulfonamide (sulfa) medicines. If you have any allergy history, mention it to a doctor or pharmacist before starting, and stop immediately if a rash develops.
Does Bactrim DS work for a urinary tract infection?+
Trimethoprim-sulfamethoxazole is a long-established treatment for uncomplicated urinary tract infections where local bacteria remain susceptible to it. Resistance rates vary by country, so it is not guaranteed to work everywhere. A doctor can judge whether it suits your case; if symptoms persist beyond two to three days of treatment, seek medical review.
Can I drink alcohol while taking Bactrim DS?+
The leaflet does not list an absolute ban, but alcohol is best avoided during any antibiotic course. It can worsen side effects such as nausea, dizziness and headache, adds to dehydration — which matters with sulfa drugs — and slows your recovery. Stay well hydrated with water instead until the course is finished.
What are the most common side effects of Bactrim DS?+
Nausea, loss of appetite, and skin rash are the most frequently reported effects. Any rash deserves attention with sulfa antibiotics: stop the tablets and contact a doctor promptly, because rare but serious skin reactions can begin this way. Increased sun sensitivity is also common — read the full leaflet before your first dose.
Can I take Bactrim DS with alcohol?+
It is best avoided. Alcohol does not cause a dangerous reaction with Bactrim DS in most people, but it can worsen nausea, dizziness and dehydration, and it puts extra strain on your liver while it processes the antibiotic. Skipping alcohol until the course is finished helps you tolerate the tablets and recover faster.
Should Bactrim DS be taken with food?+
Yes, taking Bactrim DS with a meal or snack and a full glass of water is recommended. Food reduces stomach upset and nausea, the most common complaints. Drinking plenty of fluids throughout the course is also important, as it helps protect the kidneys while the medicine is being cleared.
What if Bactrim DS doesn't work the first time?+
If your symptoms have not started improving after two to three days of correct dosing, do not simply take more. The bacteria may be resistant to sulfamethoxazole-trimethoprim, or the diagnosis may need reviewing. See a doctor — they may switch you to a different antibiotic class rather than repeating the same course.
How long does Bactrim DS stay in your system?+
Trimethoprim has a half-life of roughly 8–10 hours and sulfamethoxazole about 10 hours in healthy adults, so most of a dose is cleared within two to three days of your last tablet. Clearance is slower if your kidneys are impaired, which is why doses are reduced in kidney disease.
Does Bactrim DS expire, and can I use old tablets?+
Yes — every blister carries a printed expiry date, typically two to three years from manufacture. Do not use tablets past that date: potency declines and the medicine may not clear your infection, which encourages resistance. Dispose of expired antibiotics at a pharmacy rather than in household waste or down the sink.
Customer reviews
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966 reviews
69% recommend this product
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- Every buyer is invited to review after delivery
- Verified-buyer reviews get the badge
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Lukas T.
26 Apr 2026
Customer service answered my WhatsApp question within minutes. Will absolutely reorder.
Priya G.
9 Apr 2026
Product itself is fine and clearly genuine, but delivery took the full window and tracking barely updated along the way.
Karolina N.
23 Mar 2026
Three days from order to door across Australia — no surprises, no hassle.
Hannah W.
1 Mar 2026
Second order now. Consistent quality, sealed blisters with clear batch numbers both times.
Reviewed by the Kamagra AUS Pharmacy TeamMedicine information reviewed 21 June 2026Next review due 21 June 2027
Sources for the medical information on this page
- Trimethoprim-Sulfamethoxazole — StatPearls, NCBI Bookshelf — Peer-reviewed reference on the co-trimoxazole combination.
- Healthdirect Australia — Trimethoprim — Search "trimethoprim" for Australian guidance on one of the two active ingredients.
This page is general product and medicine information, not a prescription or a substitute for medical advice. Always read the patient information leaflet supplied with your medicine, and speak to a doctor or pharmacist before starting Bactrim DS — especially if you take other medicines or have a heart, liver or kidney condition.
Health guides
Guides & related reading for Bactrim DS
12 pharmacist-written guides — newest research first.
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Common searches about Bactrim DS — answered on this page
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Choosing between options
Where to buy Bactrim DS in Australia
Bactrim DSisn't stocked on Australian chemist shelves — it's an imported generic, so buying happens online. Kamagra AUS ships genuine, sealed Bactrim DS from $57.18 (4 pack sizes, lower per-unit price on larger packs) Australia-wide. Orders dispatch within one business day of payment and arrive in 2-4 business days — free delivery over $150.00 (flat $12 otherwise).
- Pay in AUD — bank transfer, PayID, credit/debit card, or PayPal. Use only your order reference, so your statement stays discreet.
- Plain, unbranded packaging with tracked delivery; prices are GST-inclusive, so no surprise costs on arrival.
- Sealed manufacturer blisters with batch number and expiry — verify any product on WhatsApp before you order.
- Delivery to every state and territory, with prices shown in AUD at checkout.