Oxytetracycline

What is Oxytetracycline Used For?

Oxytetracycline is used to treat acne, rosacea, and other bacterial infections. A tetracycline antibiotic, it works by targeting bacteria that cause facial inflammation and lesions. It's typically prescribed for moderate-to-severe inflammatory acne. This is the kind that involves red, swollen spots (papules and pustules) rather than just blackheads and whiteheads.

The medication is suitable for most people; however, it is not suitable for pregnant or breastfeeding women, unless they are specifically advised by a doctor to take it. Oxytetracycline should always be used alongside a topical treatment such as Differin or Epiduo and not on its own.

Other Uses of Oxytetracycline

Oxytetracycline is a broad-spectrum antibiotic licensed for a range of conditions beyond acne. Other oxytetracycline uses include:

• Rosacea: Licensed for severe rosacea when antibiotic treatment is considered necessary.
• Respiratory tract infections: Including pneumonia, whooping cough, and chronic bronchitis.
• Urinary tract infections: Caused by susceptible bacteria.
• Sexually transmitted infections: Including chlamydia and non-gonococcal urethritis.
• Other infections: Including brucellosis, cholera, and leptospirosis.

It’s important to note that the dosage and duration of treatment will vary by condition. Your prescriber will advise you on which regimen is best suited for you.

How Does Oxytetracycline Work for Acne?

Acne develops when dead skin cells block hair follicles, trapping sebum – the oil your skin naturally produces. A bacterium called Cutibacterium acnes (C. acnes) feeds on this trapped sebum and releases irritants that cause redness, swelling, and spots. Oxytetracycline prevents the growth and spread of C. acnes by interfering with the proteins bacteria need to survive. This reduces inflammation, allowing the skin to heal. It doesn't address the root causes of acne, such as excess oil production, which is why it works best alongside a topical treatment.

Acne commonly affects the face, back, and chest, and can impact mental health at any severity. If it's affecting your mood, confidence, or daily life, speak to your prescriber or GP.

How Long Does Oxytetracycline Take to Work?

Oxytetracycline doesn't produce overnight results. It may take several weeks for the treatment to start working, so you should continue taking it for as long as prescribed. Most people begin to see improvement after six to eight weeks of consistent use.

Treatment is usually prescribed as a 12-week course. At that point, your prescriber will review your progress. If your acne's cleared, they may advise you to stop the antibiotic while continuing your topical treatment. If it's improved but not fully cleared, continuing for up to 12 more weeks may be considered. Antibiotic courses for acne shouldn't normally continue beyond six months.

If you don't notice an improvement in your condition after your course, you can reach out to one of our prescribers. They can review your treatment and advise whether to continue, switch, or consider alternatives.

How Effective is Oxytetracycline for Acne?

Tetracycline-class antibiotics have been used in acne treatment for decades and are well established for reducing inflammatory lesions when used alongside topical treatments. The available data support its effectiveness:

• NHS-funded trial (649 patients, UK): A randomised study across Nottingham, Leeds, and Stockton-on-Tees found that 55% of participants taking oxytetracycline reported moderate or greater improvement at 18 weeks, with the most noticeable progress in the first six weeks.
• Systematic review (57 trials, international): A comprehensive analysis of all oral tetracycline acne trials from 1962–2006 found consistent effectiveness across the class, with reductions in inflammatory lesions averaging around 54% regardless of the tetracycline used.
• Leeds General Infirmary trial (69 patients, UK): A randomised double-blind study found that oxytetracycline was the only treatment to produce significant improvement in back acne, suggesting a benefit for truncal acne that topical treatments alone may not reach.

Individual results vary. Oxytetracycline works best when used alongside a topical treatment, with consistent use throughout the full prescribed course.

How to Take Oxytetracycline 250mg Tablets

For acne treatment, the usual dose is 500 mg twice daily (two 250 mg tablets). Your prescriber may adjust this based on severity and response.

• Take on an empty stomach: At least one hour before food or two hours after. Note that dairy products will significantly reduce absorption.
• Swallow whole with a full glass of water: This helps prevent irritation of the gullet.
• Don't take just before bed: Take well before lying down.
• Avoid certain supplements at the same time: Antacids and preparations containing aluminium, calcium, iron, magnesium, or zinc interfere with absorption. Leave at least two to three hours between them.
• Use a topical treatment alongside it: Always combine with a non-antibiotic topical such as Epiduo or Differin, applied in the evening.

What If I Forget to Take Oxytetracycline Tablets?

If it's been more than two hours since your dose was due, skip it and take the next one at the usual time. Don't double up. If you regularly forget, try setting a reminder. Consistent use matters.

What If You Take Too Many Oxytetracycline Pills

If you've taken more than your prescribed dose, contact your doctor or pharmacist straight away, or call 111 for advice. If you feel seriously unwell, have difficulty breathing, or collapse, call 999 or go to A&E immediately. Take the tablet packaging with you so they can see what you've taken.

What If I Stop Taking Oxytetracycline Early?

Complete the full course as prescribed, even if your skin improves. Stopping early can allow bacteria to recover and may contribute to antibiotic resistance. If side effects are making it difficult to continue, speak to your prescriber before stopping.

Oxytetracycline Side Effects and Cautions

Every medication has its own active ingredient and mechanism of action. This can cause adverse effects in people and impact other areas of their lives. It’s therefore essential to have a clear understanding of what you could encounter before starting treatment.

Side Effects of Oxytetracycline

All medications carry the potential risk of side effects, though it is never guaranteed that you will experience them. Being aware of the risks associated with your treatment is important to your care.

Potential Oxytetracycline side effects include:

• Nausea or vomiting
• Diarrhoea
• Loss of appetite
• Discolouration of tooth enamel
• Difficulty swallowing
• Inflammation of the pancreas
• Thrush or irritation around your bottom or genitals 
• Redness or colour change of the skin
• Hives
• Constipation
• Swelling/itching of the vulva and vagina
• Oesophageal irritation or ulceration

It’s important to note that the above is not an exhaustive list of Oxytetracycline side effects. You should ensure you read the enclosed Patient Information Leaflet before starting treatment.

Additional Notes Regarding Oxytetracycline Side Effects

This section outlines extra information about the potential side effects of Oxytetracycline, including how long they last, what can help to alleviate them, and how severe they could be:

• Nausea or vomiting: Take the tablets with plenty of water to help reduce the risk. 
• Diarrhoea: Usually mild and temporary. Tell your doctor or clinician if you experience pseudomembranous colitis (watery diarrhoea, cramps, and fever).  
• Loss of Appetite: This usually settles as your body adjusts to the medication.
• Oesophageal irritation or ulceration: More likely if taken without enough water or before bed.
• Difficulty swallowing: Seek advice if this occurs. 
• Discolouration of tooth enamel: This is a risk of tetracycline-class antibiotics and is not usually a concern in adults. 
• Thrush or irritation: Antibiotics can disrupt normal bacterial balance. Maintain a balanced diet and consider taking probiotics as advised by your clinician.
• Skin rashes, hives, or redness: These may indicate an allergic reaction. See below for more information. 
• Photosensitivity: Increased sensitivity to sunlight. Use SPF 30+ sunscreen daily, and avoid sunbeds.

Serious Side Effects of Oxytetracycline

Stop taking oxytetracycline and seek medical help immediately if you experience:

• Sudden swelling of the face, lips, tongue, or throat, difficulty breathing, widespread rash, or intense itching – signs of a serious allergic reaction.
• Persistent or worsening headache or visual disturbances may indicate increased pressure inside the skull.
• Chest pain, shortness of breath, or a dry cough could indicate pericarditis.
• Yellowing of the skin or eyes (jaundice), dark urine, or severe fatigue. These are signs of liver problems.
• Unusual bruising or bleeding, persistent sore throat, or frequent infections. These are potential signs of a blood disorder.
• A skin reaction akin to sunburn that is caused by photosensitivity (increased sensitivity to UV and sunlight)

Oxytetracycline and Testing

If you're taking oxytetracycline long-term, your prescriber may arrange periodic blood tests to monitor kidney and liver function, as well as blood cell counts. This is routine and isn't a cause for concern.

Oxytetracycline Pills Warnings and Interactions

Oxytetracycline is an effective acne treatment, but it's not suitable for everyone. The tablets may interact with other medicines or supplements and are not permitted for use by people with certain medical conditions.

You should not take the medication if you:

• Are allergic to oxytetracycline, other tetracyclines, or any of the ingredients 
• Have or have had liver or kidney problems
• Have systemic lupus erythematosus
• Are taking systemic/oral retinoids or vitamin A therapy
• Have a condition called porphyria

Precautions for Taking Oxytetracycline Tablets

Talk to your prescriber before starting if you have any liver problems, reduced kidney function, or myasthenia gravis. Oxytetracycline can cause photosensitivity, so take care in strong sunlight and avoid sunbeds.

Our service supplies oxytetracycline to adults aged 18 and over. This is a service restriction, though the medicine is licensed for use from age 12. Patients under 18 should consult their GP.

Oxytetracycline and Other Medications

Tell your prescriber about all medicines you're taking. These include:

• Diuretics: May increase the risk of kidney-related side effects.
• Penicillin antibiotics: Should not be taken together.
• Blood thinners (anticoagulants), such as warfarin: May be affected by oxytetracycline.
• Insulins or sulphonylureas such as gliclazide: May increase blood-sugar-lowering effect.
• Antacids: Leave at least two to three hours between doses.
• Kaolin-pectin and bismuth subsalicylate: Can impair absorption.
• Lithium: Oxytetracycline may raise lithium levels.
• Methoxyflurane: Tell your doctor before surgery.

Oxytetracycline and Contraceptive Pills

Oxytetracycline can make birth control pills less effective. If you're taking an oral contraceptive (the pill), you should use an additional form of contraceptive precaution while taking oxytetracycline and for 7 days after stopping. If you're unsure what precautions to take, speak to your prescriber.

Pregnancy and Breastfeeding

Do not take oxytetracycline if you are pregnant, planning to become pregnant, or breastfeeding. Tetracyclines can affect foetal development, cause permanent tooth discolouration, and be excreted in breast milk. If you discover you're pregnant while taking it, stop immediately and speak to your doctor.

If you need an antibiotic for acne during pregnancy, your prescriber can discuss alternatives. NICE also advises using effective contraception while on a tetracycline.
 

Frequently Asked Questions About Oxytetracycline 250mg