A tetracycline antibiotic for acne
Minocycline
A tetracycline antibiotic taken by mouth for moderate acne, working on both the bacteria and the inflammation behind spots.
What is Minocycline?
Minocycline is a tetracycline antibiotic used to treat moderate inflammatory acne. It reduces the bacteria involved in acne and calms the inflammation that causes red, painful spots. It is taken as a long course over several weeks to months, and is not used in pregnancy, breastfeeding or in children under 12.
Education and reference only. This is a plain-language guide to Minocycline — 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
Minocycline is a tetracycline antibiotic used in the UK mainly for moderate inflammatory acne that has not settled with creams and gels alone. It is taken by mouth, usually as a course lasting several weeks to a few months, and works gradually rather than overnight. It is one of several oral antibiotics used for acne; lymecycline and doxycycline are often preferred first because minocycline carries a few rarer but more serious risks. It is not a quick fix and is generally combined with topical acne treatments.
How it works
Minocycline works in two ways for acne. As an antibiotic, it reduces the numbers of the skin bacteria (Cutibacterium acnes) involved in spots. Just as importantly, tetracyclines have an anti-inflammatory effect, calming the redness and swelling that turn blocked pores into painful, inflamed spots. Because the benefit builds over time, it is taken as a sustained course and usually alongside topical treatments to improve results and reduce reliance on the antibiotic alone.
Company & origin
Originated / developed by: Wyeth (now part of Pfizer).
A semi-synthetic tetracycline developed in the United States and introduced from the early 1970s, long used for acne and other infections.
What it treats
Conditions Minocycline is used for
Practical use
How to take Minocycline
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Swallow with a full glass of water while sitting or standing upright, and stay upright for a while afterwards.
- It can be taken with food, which may reduce stomach upset.
- Take it as a regular course for the full length prescribed, even once your skin starts to clear.
- Use sun protection, as it can make your skin more sensitive to sunlight.
- Continue any topical acne treatments your prescriber recommends alongside it.
- Report any unusual joint pain, persistent headache, skin discolouration or yellowing of the skin or eyes promptly.
Weighing it up
Advantages & disadvantages of Minocycline
Advantages
- Effective for moderate inflammatory acne when topical treatments are not enough.
- Tackles both the bacteria and the inflammation behind spots.
- Can be taken with food, unlike some other tetracyclines.
- Usually taken less often through the day than plain tetracycline.
Disadvantages
- Rarely linked to more serious reactions (lupus-like illness, hepatitis, raised pressure in the head).
- Can cause blue-grey staining of skin, gums or teeth with longer use.
- 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
Minocycline is taken with a full glass of water while sitting or standing upright, and you should stay upright afterwards to stop the capsule irritating the gullet. It can make the skin more sensitive to sunlight, so sun protection is sensible. Unlike some other tetracyclines, it can be taken with food. It is usually a second-line choice because, rarely, it can cause a lupus-like reaction, liver inflammation, blue-grey skin or gum staining, or raised pressure in the head. It must not be used in pregnancy, breastfeeding or in children under 12.
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 liver problems or a history of lupus-type illness.
- Anyone allergic to tetracycline antibiotics.
Monitoring
- Review of skin response and side effects, with courses kept no longer than needed.
- Watch for headache with visual changes, joint pains or yellowing of skin or eyes.
- Liver function may be checked if it is used for a long time or symptoms develop.
Side effects
- Stomach upset, nausea and increased sensitivity to sunlight.
- Dizziness or a spinning sensation.
- With longer use, blue-grey discolouration of skin, gums, teeth or nails.
- Rarely, a lupus-like reaction, liver inflammation, severe skin reactions or raised pressure in the head (severe headache with visual changes) — seek urgent advice.
Key interactions
- Antacids, and supplements containing iron, calcium, magnesium or zinc, reduce absorption — separate them in time.
- It can increase the blood-thinning effect of warfarin, so your INR (clotting) may need closer monitoring.
- Some acne or skin 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: Capsules and tablets, including modified-release versions, taken by mouth.
Answers
Minocycline: frequently asked questions
How long does minocycline take to work for acne?
It works gradually. You may not see much change for several weeks, and the full benefit can take a couple of months. It is taken as a sustained course, usually alongside topical treatments.
Why is it not a first choice for acne?
Other tetracyclines such as lymecycline and doxycycline are often preferred because minocycline carries some rarer but more serious risks, including a lupus-like reaction, liver inflammation and skin discolouration.
Can I take it in pregnancy or give it to my child?
No. Tetracyclines including minocycline are not used in pregnancy, breastfeeding or in children under 12, because they can affect developing bones and stain developing teeth.
Why must I take it sitting upright with water?
Taking it upright with a full glass of water helps the capsule reach the stomach rather than lodging in the gullet, where it can cause irritation.
Will it make my skin more sensitive to the sun?
It can. Use sun protection and avoid strong sun where possible, and report any unusual sunburn-like reaction to your prescriber.
The wider class
About Tetracyclines
Minocycline belongs to the tetracyclines class. For how the class as a whole works, its shared safety principles and monitoring, see the full guide.
Browse by body system
Authoritative sources
- BNF
- NICE CKS
Building a medicines information resource?
We create evidence-led, dose-free drug and formulary references for teams.