Amoxicillin Dosage Strengths Explained
Reviewed by the Kamagra AUS Pharmacy Team on 19 September 2026 · Next review June 2027
Summary
An overview of why amoxicillin comes in 250mg, 500mg, 650mg and 1000mg strengths, and how your doctor decides which one suits your infection.
On this page
Amoxicillin comes in several different strengths, and it's a common question why one person is prescribed a lower strength while another is given something higher. The short answer is that the right strength depends on the type and severity of infection, your body weight, kidney function and other individual factors your doctor takes into account. Kamagra AUS stocks the full range, from Amoxicillin 250mg through Amoxicillin 500mg, Amoxicillin 650mg and Amoxicillin 1000mg, so your prescriber can match the product to what's actually been prescribed.
Why Strength Varies
Not all bacterial infections are equal. A mild skin infection might respond well to a lower total daily amount, while a more serious or deep-seated infection might call for a higher strength or more frequent dosing to keep drug levels high enough to keep bacteria from multiplying. Your prescriber works this out based on clinical guidelines, your specific diagnosis and your personal health profile, not a one-size-fits-all rule.
Body weight and age matter too. What's appropriate for a smaller-framed adult may differ from what's appropriate for someone larger, and kidney function plays a role because amoxicillin is cleared from the body through the kidneys. None of this is something to work out on your own, it's exactly why a prescription and medical assessment sit in front of every amoxicillin order.
The Four Strengths at a Glance
250mg
Often used where a lower total daily amount is clinically appropriate, or as part of a dosing schedule that spreads doses more frequently across the day.
500mg
One of the most commonly prescribed strengths for adults with a range of everyday bacterial infections, including some respiratory and urinary tract infections.
650mg
Sits between the more common 500mg and 1000mg strengths and may be used where a prescriber wants a specific total daily amount without doubling up on lower-strength tablets.
1000mg
A higher strength sometimes used for more significant infections, or where less frequent dosing is preferred for practical reasons such as convenience with a busy routine.
Never Adjust the Strength Yourself
It can be tempting to think that taking a higher strength will clear an infection faster, or that splitting a higher-strength tablet will stretch out a prescription. Neither is a good idea. The strength and total course your doctor prescribes is calculated for your specific infection, and changing it without medical advice can mean the infection isn't properly treated, or that you experience side effects unnecessarily. If a strength doesn't feel like it's working, or if you're finding it hard to manage, contact your prescriber rather than adjusting things on your own.
This also matters for the broader problem of antibiotic resistance within the antibiotics category: underdosing an infection can allow the toughest bacteria to survive and adapt.
Getting the Right Strength
If your doctor has written a prescription for a specific strength of amoxicillin, our pharmacy team dispenses exactly what's prescribed. If you have questions about why a particular strength was chosen, or whether an alternative might suit you better, that conversation belongs with your prescriber. Always read the patient information leaflet supplied with your medicine, and check with your doctor or pharmacist if anything is unclear before you start your course.
Frequently asked questions
Is a higher strength of amoxicillin always more effective?+
Not necessarily. The right strength depends on the infection being treated, not simply on how high the number is. Your prescriber selects the strength that matches your diagnosis.
Can I split a higher-strength tablet instead of taking a lower-strength one?+
No, don't adjust your medicine this way without talking to your doctor or pharmacist first, as it can affect how the medicine works and is safe to take.
Why do the strengths look like unusual numbers, like 650mg?+
Manufacturers produce a range of strengths to give prescribers flexibility in reaching a specific total daily amount. Your pharmacist can explain the option prescribed for you.
Kamagra AUS Health Editorial Team
Plain-English health writing from our in-house editorial team — pharmacist-reviewed, focused on how Australians actually access and use medicines safely.
Related treatments
Browse the medicines and conditions related to this guide:
Mentioned in this guide
Shop the treatments covered here
Genuine medicines from the guide above — discreetly delivered Australia-wide.
