A tetracycline antibiotic for acne
Tetracycline
The original tetracycline antibiotic, taken by mouth on an empty stomach for acne by reducing bacteria and inflammation.
What is Tetracycline?
Tetracycline is the original antibiotic of the tetracycline family, used to treat inflammatory acne. It reduces the bacteria linked to acne and calms the inflammation behind spots. It must be taken on an empty stomach away from dairy, antacids and iron, and is not used in pregnancy or in children under 12.
Education and reference only. This is a plain-language guide to Tetracycline — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Tetracycline is the original member of the tetracycline class of antibiotics and is used in the UK for inflammatory acne, among other infections. It is taken by mouth as a course over several weeks to months and works gradually. Compared with newer tetracyclines such as lymecycline and doxycycline, it is less convenient because it must be taken on an empty stomach and kept away from food, dairy and certain supplements, which is why the newer relatives are often preferred. It is usually combined with topical acne treatments.
How it works
Tetracycline works in two ways for acne. As an antibiotic, it reduces the skin bacteria (Cutibacterium acnes) involved in spots by stopping the bacteria making the proteins they need to grow. Tetracyclines also have a useful anti-inflammatory effect, calming the redness and swelling that make spots painful. Because the improvement builds slowly, it is taken as a regular course and usually alongside topical acne treatments to get the best result.
Company & origin
Originated / developed by: Originally developed by Pfizer and Lederle in the 1950s.
One of the first tetracycline antibiotics, developed in the United States in the 1950s; it gives the whole drug class its name.
What it treats
Conditions Tetracycline is used for
Practical use
How to take Tetracycline
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Take it on an empty stomach, around an hour before or two hours after food.
- Swallow with a full glass of water while upright, and stay upright for a while afterwards.
- Keep it well apart from milk and dairy, antacids, and iron, calcium, magnesium or zinc supplements.
- Take it as a regular course for the full length prescribed, even once your skin improves.
- Use sun protection, as it can make your skin more sensitive to sunlight.
- Continue any topical acne treatments your prescriber recommends alongside it.
Weighing it up
Advantages & disadvantages of Tetracycline
Advantages
- A long-established, effective antibiotic for inflammatory acne.
- Tackles both the bacteria and the inflammation behind spots.
- Widely available and inexpensive.
- Usually combined well with topical acne treatments.
Disadvantages
- Must be taken on an empty stomach, away from food, dairy and certain supplements — easy to get wrong.
- Usually needs taking more often through the day than newer tetracyclines.
- Not suitable in pregnancy, breastfeeding or for children under 12.
- Makes the skin more sensitive to sunlight, and works slowly over weeks.
Practical use
Good to know
Tetracycline must be taken on an empty stomach — typically an hour before or two hours after food — with a full glass of water while upright, and you should stay upright afterwards. Crucially, it should be kept away from milk and other dairy, antacids, and supplements containing iron, calcium, magnesium or zinc, because these bind to it and stop it being absorbed. It can make the skin more sensitive to sunlight. It is not used in pregnancy, breastfeeding or in children under 12, as it can stain developing teeth.
Who should not take it / use with caution
- Women who are pregnant or breastfeeding.
- Children under 12 (it can stain developing teeth).
- People with significant kidney problems.
- Anyone allergic to tetracycline antibiotics.
Monitoring
- Review of skin response and side effects, with courses kept no longer than needed.
- Watch for severe headache with visual changes or signs of an allergic reaction.
- Kidney function is considered before use in people with kidney problems.
Side effects
- Stomach upset, nausea and increased sensitivity to sunlight.
- Diarrhoea or, occasionally, thrush.
- Difficulty swallowing or irritation of the gullet if not taken upright with enough water.
- Rarely, severe headache with visual changes (raised pressure in the head) or a serious allergic reaction — seek urgent advice.
Key interactions
- Milk and dairy, antacids, and iron, calcium, magnesium or zinc supplements bind to it and stop absorption — keep well apart.
- It can affect the action of warfarin. Tetracyclines are no longer thought to reduce how well the combined contraceptive pill works in most cases — follow current advice from your prescriber.
- Some acne medicines (such as oral retinoids) should not be combined because of the head-pressure risk.
- Tell a pharmacist about all other medicines and supplements you take.
Available as: Tablets and capsules taken by mouth.
Answers
Tetracycline: frequently asked questions
Why must tetracycline be taken on an empty stomach?
Food, and especially milk and dairy, antacids and mineral supplements, bind to tetracycline and stop it being absorbed. Taking it on an empty stomach and away from these makes sure it works.
Why is it taken away from milk and supplements?
Calcium in dairy and minerals such as iron, magnesium and zinc bind to tetracycline in the gut, forming compounds the body cannot absorb. Keep them well apart in time.
How long does it take to clear acne?
It works slowly, with improvement building over several weeks to a couple of months. It is taken as a sustained course, usually alongside topical treatments.
Can I take it in pregnancy or give it to my child?
No. Tetracyclines are not used in pregnancy, breastfeeding or in children under 12, because they can affect developing bones and stain developing teeth.
Does it make my skin sensitive to the sun?
Yes, it can increase sensitivity to sunlight. Use sun protection, avoid strong sun where possible, and report any unusual sunburn-like reaction.
The wider class
About Tetracyclines
Tetracycline belongs to the tetracyclines class. For how the class as a whole works, its shared safety principles and monitoring, see the full guide.
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Authoritative sources
- BNF
- NICE CKS
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