A tetracycline antibiotic
Oxytetracycline
An older tetracycline antibiotic, used in the UK mainly for acne and some other infections.
What is Oxytetracycline?
Oxytetracycline is a tetracycline antibiotic used mainly for acne and certain chest, skin and other infections. It is taken as a tablet, ideally on an empty stomach with plenty of water while sitting or standing upright. It is not suitable in pregnancy, while breastfeeding, or for children under 12, and it can make the skin more sensitive to sunlight.
Education and reference only. This is a plain-language guide to Oxytetracycline — 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
Oxytetracycline is one of the older tetracycline antibiotics and is still used in the UK, most commonly as a treatment for moderate acne and rosacea, and for some respiratory and skin infections. In acne it is taken over several weeks to months, and works gradually rather than overnight. Like the rest of the tetracycline class, it has particular cautions around pregnancy, young children and sunlight.
How it works
Oxytetracycline stops bacteria making the proteins they need to grow and multiply, by binding to the bacterial ribosome (the protein-building machinery). In acne it also helps by reducing the bacteria involved in spots and calming inflammation, which is why improvement builds up over weeks.
What it treats
Conditions Oxytetracycline is used for
Practical use
How to take Oxytetracycline
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Swallow tablets whole with a full glass of water, sitting or standing upright.
- Stay upright for a while afterwards and avoid taking it just before lying down or bed.
- Take on an empty stomach where possible, ideally an hour before or two hours after food.
- Keep milk, antacids, and iron, zinc or calcium supplements a few hours apart from your dose.
- Use sun protection, as your skin may be more sensitive to sunlight.
- For acne, keep taking it as directed — improvement builds up over several weeks.
Weighing it up
Advantages & disadvantages of Oxytetracycline
Advantages
- A long-established, low-cost option for acne and some other infections.
- Taken as a simple oral tablet at home.
- Helps acne both by reducing bacteria and by calming inflammation.
Disadvantages
- Not suitable in pregnancy, breastfeeding, or for children under 12, as it can stain developing teeth.
- Best taken on an empty stomach and kept apart from dairy and supplements, which is fiddly.
- Can make the skin more sensitive to sunlight.
- Needs to be taken for weeks in acne before the benefit is clear.
Practical use
Good to know
Take it on an empty stomach with a full glass of water, sitting or standing upright and staying upright for a while afterwards, so the tablet does not irritate the gullet. Separate it in time from milk, antacids and iron or other mineral supplements, which bind it and stop it being absorbed. Your skin may burn more easily in the sun, and for acne it often takes some weeks before you see the benefit.
Who should not take it / use with caution
- Women who are pregnant or breastfeeding, and children under 12 years, because tetracyclines can affect developing teeth and bones.
- People who have had a serious reaction to a tetracycline antibiotic.
- Used with caution in significant kidney problems, and in people prone to lupus-like reactions.
Monitoring
- Skin response over several weeks in acne
- For any severe headache or visual symptoms
- Kidney function where relevant in longer courses
Side effects
- Nausea, stomach upset or diarrhoea; irritation or discomfort in the gullet if not taken upright with water.
- Increased sensitivity of the skin to sunlight, with easier sunburn.
- Less commonly, thrush, headache, or — rarely — severe headache with visual disturbance, which should be reported.
Key interactions
- Milk and dairy, antacids, and iron, zinc, calcium or magnesium supplements bind it and reduce absorption — separate the timing.
- Can increase the effect of warfarin, so monitoring may be needed.
- May reduce the reliability of some other medicines; check new medicines with your pharmacist.
Available as: Tablets.
Answers
Oxytetracycline: frequently asked questions
Can I take oxytetracycline if I am pregnant or breastfeeding?
No. Tetracyclines, including oxytetracycline, are avoided in pregnancy and breastfeeding because they can affect a baby's developing teeth and bones. Tell your prescriber if you are pregnant, might be, or are breastfeeding.
Why must I take it on an empty stomach and stay upright?
Food, especially dairy, reduces how much is absorbed, so it works best on an empty stomach with water. Staying upright after swallowing helps stop the tablet irritating the gullet.
How long until my acne improves?
Acne usually responds slowly, so it often takes several weeks before you notice a clear difference, and a course may continue for some months. Keep taking it as directed and don't expect overnight results.
Can I sunbathe while taking it?
Be careful, as oxytetracycline can make your skin burn more easily. Use sun protection and avoid prolonged strong sun or sunbeds during treatment.
Can children take oxytetracycline?
It is not used in children under 12 because it can permanently stain developing teeth. Younger children are given a different type of antibiotic instead.
The wider class
About Tetracyclines
Oxytetracycline 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: Oxytetracycline.
- NICE CKS: Antibiotics.
- NICE: Acne vulgaris management.
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