Tetralysal

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Tetralysal on Prescriptsy

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Tetralysal is a prescription-only antibiotic capsule containing lymecycline 408 mg (equivalent to 300 mg tetracycline base), licensed in the United Kingdom for the treatment of acne vulgaris.

It belongs to the tetracycline class of antibiotics and works by targeting the bacteria involved in acne while also reducing the inflammation that causes painful red spots, papules, and pustules.

Tetralysal is manufactured by Galderma and remains one of the most commonly prescribed oral antibiotics for acne in UK clinical practice.

Acne vulgaris is the most common skin condition in the United Kingdom, affecting an estimated 95% of people at some point between the ages of 11 and 30.

While often considered a condition of adolescence, acne frequently persists into adult life.

Moderate to severe inflammatory acne can have a significant impact on self-esteem, mental health, and quality of life.

This page provides comprehensive clinical information about Tetralysal, including how it works, correct dosage, potential side effects, safety warnings, and how to obtain a prescription in the UK.

Important safety information about Tetralysal

Before reading further, note the following key safety points about Tetralysal.

• Do not take Tetralysal if you are pregnant or breastfeeding. Tetracyclines can cause permanent tooth discolouration and bone development problems in the unborn baby and nursing infant.
• Do not give Tetralysal to children under 12 years of age.
• Avoid prolonged sun exposure and UV tanning equipment during treatment. Lymecycline causes photosensitivity.
• Swallow capsules with a full glass of water while sitting or standing upright to prevent oesophageal irritation.
• Do not take Tetralysal at the same time as dairy products, antacids, or iron supplements.

What is acne vulgaris

Acne vulgaris is a chronic inflammatory disease of the pilosebaceous unit.

It develops when hair follicles become blocked by a combination of excess sebum production, abnormal keratinisation of the follicular epithelium, colonisation by Cutibacterium acnes, and a consequent inflammatory response.

The result is a spectrum of lesions ranging from non-inflammatory comedones (blackheads and whiteheads) through inflammatory papules and pustules to deep nodules, cysts, and, in severe cases, scarring.

Androgens stimulate the sebaceous glands during puberty, which explains the onset of acne in adolescence.

However, hormonal fluctuations, stress, certain medications (including corticosteroids and lithium), and genetic predisposition all influence acne severity and duration.

Acne commonly affects the face, back, chest, and shoulders, where sebaceous gland density is highest.

Acne in the United Kingdom

Acne is responsible for approximately 3.5 million GP consultations per year in the UK.

NICE Clinical Knowledge Summary on Acne Vulgaris estimates that 80% of teenagers are affected to some degree, and around 5% of women and 1% of men continue to experience acne beyond the age of 25.

The psychological burden of acne is well documented, with studies showing increased rates of anxiety, depression, social withdrawal, and reduced quality of life.

Early and effective treatment can prevent scarring and improve psychological outcomes.

How Tetralysal works: mechanism of action

Lymecycline is a water-soluble prodrug that is rapidly and completely absorbed from the upper gastrointestinal tract. Once absorbed, it is hydrolysed to release free tetracycline, which distributes into tissues including the sebaceous glands and pilosebaceous follicles where Cutibacterium acnes resides.

The primary mechanism of action is inhibition of bacterial protein synthesis.

Tetracycline enters the bacterial cell and binds reversibly to the 30S ribosomal subunit, blocking the attachment of aminoacyl-transfer RNA to the messenger RNA-ribosome complex.

This prevents the addition of new amino acids to the growing peptide chain, halting bacterial growth. At the concentrations achieved in sebaceous tissue, lymecycline is bacteriostatic against C.

acnes.

Beyond direct antibacterial activity, tetracyclines possess anti-inflammatory properties that are clinically relevant in acne.

They inhibit matrix metalloproteinases (MMPs), particularly MMP-9 and MMP-2, which are involved in tissue remodelling and inflammatory tissue destruction.

They also reduce neutrophil chemotaxis and migration into the follicle, decrease the production of pro-inflammatory cytokines (including tumour necrosis factor alpha and interleukins), and inhibit the generation of reactive oxygen species.

These combined anti-inflammatory effects are thought to contribute significantly to the clinical improvement observed in inflammatory acne, sometimes independently of their antibacterial action.

Pharmacokinetic advantages of lymecycline

Lymecycline was developed to overcome the poor and variable absorption of tetracycline hydrochloride.

By conjugating tetracycline with the amino acid lysine, the resulting prodrug is significantly more water-soluble and achieves higher, more predictable serum concentrations after oral dosing.

This allows effective once-daily dosing at 408 mg (compared with tetracycline hydrochloride, which typically requires twice-daily administration at 500 mg).

Once-daily dosing improves patient adherence, which is particularly important in acne, where treatment courses last several months.

Clinical evidence and national guidelines

The use of oral tetracyclines for moderate to severe inflammatory acne is supported by extensive clinical evidence and is recommended by both NICE and the British Association of Dermatologists (BAD).

NICE Clinical Knowledge Summary on Acne Vulgaris recommends a first-line oral antibiotic (either lymecycline 408 mg once daily or doxycycline 100 mg once daily) for moderate to severe inflammatory acne that has not responded adequately to topical treatment alone.

There is no clear evidence that one oral tetracycline is superior to another in efficacy, so the choice between lymecycline and doxycycline is often guided by tolerability, convenience, and patient preference.

A randomised controlled trial published in the British Journal of Dermatology compared lymecycline 300 mg (as tetracycline base) with placebo over 12 weeks in patients with moderate facial acne.

The lymecycline group showed a statistically significant reduction in inflammatory lesion count (papules and pustules) compared with placebo, with a mean reduction of approximately 50% from baseline.

Non-inflammatory lesion counts (comedones) also improved, although the primary benefit of oral antibiotics in acne is on inflammatory lesions.

BAD guidelines (2024) recommend that oral antibiotics for acne should be prescribed alongside a topical non-antibiotic agent (typically benzoyl peroxide or a topical retinoid) to improve efficacy and reduce the emergence of antibiotic resistance.

Oral antibiotics should not be used for longer than 3 months per course where possible, and topical antibiotics should not be combined with oral antibiotics.

After a successful course, maintenance therapy with a topical retinoid or benzoyl peroxide is recommended to prevent relapse.

Dosage and administration

The standard dose of Tetralysal for acne vulgaris is one 408 mg capsule taken once daily by mouth.

The capsule should be swallowed whole with a full glass of water (at least 200 ml) while the patient is sitting or standing upright.

Taking the capsule in a recumbent position or with insufficient water increases the risk of oesophageal irritation and ulceration, which is a recognised adverse effect of tetracycline antibiotics.

Timing and food interactions

Tetralysal can be taken with or without food.

However, the absorption of lymecycline is significantly reduced by concurrent ingestion of dairy products (milk, cheese, yoghurt), antacids containing aluminium, calcium, or magnesium, iron supplements, and zinc supplements.

These substances contain divalent or trivalent metal cations that form insoluble chelates with tetracyclines in the gut, preventing absorption.

Patients should allow at least 2 hours between taking Tetralysal and consuming any of these products.

Duration of treatment

NICE recommends an initial treatment course of at least 8 weeks before assessing clinical response, as improvement is gradual. A typical course lasts 12 weeks.

If acne has improved satisfactorily at 12 weeks, treatment should be stopped and the patient should continue maintenance therapy with a topical agent.

If there is insufficient improvement at 12 weeks, the prescriber may consider switching to an alternative oral antibiotic (such as doxycycline if lymecycline was used first, or vice versa) or referring the patient to a dermatologist.

Continuous use of oral antibiotics beyond 6 months is discouraged to reduce the development of antibiotic resistance.

Side effects of Tetralysal

Common side effects

The most frequently reported side effects of lymecycline are gastrointestinal disturbances including nausea, abdominal discomfort, and diarrhoea.

These are usually mild and often improve after the first few days of treatment. Taking the capsule with a meal (excluding dairy) may help reduce stomach upset.

Headache is also commonly reported.

Photosensitivity

All tetracycline antibiotics can cause photosensitivity, and this is a clinically important side effect of Tetralysal.

Affected patients develop an exaggerated sunburn-like reaction after exposure to ultraviolet (UV) radiation, including natural sunlight and artificial UV sources such as tanning beds.

The reaction typically affects sun-exposed areas (face, neck, forearms, hands) and can range from mild erythema to severe blistering.

Patients should apply a broad-spectrum sunscreen with SPF 30 or higher daily during treatment, wear protective clothing including a wide-brimmed hat, and avoid unnecessary sun exposure and sunbed use.

If a significant photosensitivity reaction develops, treatment should be discontinued and the prescriber consulted.

Oesophageal effects

Oesophageal irritation, ulceration, and dysphagia have been reported with tetracycline antibiotics.

The risk is minimised by swallowing the capsule with a full glass of water and remaining upright for at least 30 minutes afterwards.

Do not take Tetralysal immediately before lying down or going to bed.

Effects on normal flora

Antibiotic treatment disrupts the normal bacterial flora of the body, which may lead to secondary infections.

Vaginal candidiasis (thrush) is a recognised complication, presenting with itching, abnormal discharge, and soreness. Oral candidiasis (thrush) may also occur.

These infections can be treated with over-the-counter antifungal preparations, but patients should consult their GP or pharmacist if symptoms persist or recur.

Rare but serious side effects

Benign intracranial hypertension (pseudotumour cerebri) is a rare but serious adverse effect associated with tetracycline antibiotics.

It presents with severe headache, visual disturbance (blurred or double vision), nausea, and papilloedema (swelling of the optic disc).

If any of these symptoms develop, stop taking Tetralysal immediately and seek urgent medical attention.

The risk is increased if tetracyclines are taken concurrently with retinoids (including isotretinoin), which is why concurrent use is contraindicated.

Hepatotoxicity, blood dyscrasias (including neutropenia, thrombocytopenia, and haemolytic anaemia), and severe skin reactions (Stevens-Johnson syndrome, toxic epidermal necrolysis) are very rare but have been reported with tetracycline class antibiotics.

Report any suspected adverse reactions via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk .

Warnings and precautions

Pregnancy and breastfeeding

Tetralysal is absolutely contraindicated during pregnancy.

Tetracyclines cross the placenta freely and are deposited in fetal bones and teeth from the second trimester onwards, causing permanent yellow-grey-brown tooth discolouration, enamel hypoplasia, and potential inhibition of skeletal growth.

Women of childbearing age should ensure effective contraception is in place before starting treatment.

If pregnancy is suspected or confirmed during treatment, Tetralysal must be stopped immediately and the prescriber informed.

Lymecycline is also contraindicated during breastfeeding, as tetracyclines are excreted in breast milk and may affect the infant's developing teeth and bones.

Age restrictions

Tetralysal should not be used in children under 12 years of age owing to the risk of permanent dental discolouration and effects on bone development.

For younger children with acne, alternative treatments such as topical benzoyl peroxide, topical retinoids, or topical antibiotics should be considered.

Drug interactions

In addition to the chelation interactions with dairy, antacids, and mineral supplements described above, lymecycline interacts with several other medicines.

Concurrent use with retinoids (oral isotretinoin, acitretin) is contraindicated owing to the additive risk of benign intracranial hypertension.

Tetracyclines may enhance the anticoagulant effect of warfarin and other vitamin K antagonists; INR should be monitored more closely when starting or stopping lymecycline.

Lymecycline may reduce the efficacy of oral typhoid vaccine (Vivotif), which should be completed at least 3 days before starting the antibiotic.

Concurrent use with methoxyflurane anaesthesia is contraindicated due to the risk of fatal nephrotoxicity.

Antibiotic resistance

Antibiotic resistance in C. acnes is a growing concern in dermatology.

To minimise resistance, oral antibiotics for acne should always be co-prescribed with a non-antibiotic topical agent (benzoyl peroxide is preferred, as it is directly bactericidal and does not promote resistance).

Treatment courses should be kept as short as effective, ideally no longer than 3 months.

If acne relapses, a different class of oral antibiotic should be considered rather than repeating the same one.

Topical antibiotics (such as topical clindamycin or topical erythromycin) should not be used at the same time as oral antibiotics, as this promotes dual-route resistance development.

How to get a Tetralysal prescription in the UK

Tetralysal is classified as a prescription-only medicine (POM) in the UK and cannot be purchased over the counter.

It is commonly prescribed by GPs, practice nurses with prescribing authority, and dermatology specialists.

For mild to moderate inflammatory acne that has not responded to at least 8 weeks of topical treatment, an oral antibiotic such as Tetralysal may be the next appropriate step in the NICE acne treatment pathway.

Prescriptions can also be obtained through authorised online prescribers registered with the General Pharmaceutical Council (GPhC).

These services involve a structured clinical assessment to determine whether Tetralysal is appropriate, safe, and likely to be effective. All UK prescriptions are dispensed by registered pharmacies.

The standard NHS prescription charge in England is 9.90 pounds per item; prescriptions are free in Scotland, Wales, and Northern Ireland.

Living with acne: practical management tips

Effective acne management involves more than taking an antibiotic. The following evidence-based strategies can complement your Tetralysal treatment and improve outcomes.

Wash affected areas gently twice daily with a mild, non-comedogenic cleanser. Do not scrub the skin, as this irritates the follicles and can worsen inflammation.

Avoid picking or squeezing spots, as this increases the risk of scarring and secondary infection. Use non-comedogenic, oil-free moisturisers and sunscreens.

In female patients, some make-up products labelled non-comedogenic are suitable for use during acne treatment.

Diet and lifestyle may play a role in acne for some individuals.

Emerging evidence suggests that high-glycaemic-index diets and frequent consumption of dairy products may exacerbate acne in susceptible individuals, although the evidence is not yet strong enough to form universal dietary recommendations.

Managing stress, maintaining a healthy weight, and regular exercise may also contribute to skin health.

If acne is causing significant psychological distress, speak to your GP, who can provide support or referral as appropriate.

When to seek urgent medical advice

While acne itself is not a medical emergency, certain situations require urgent attention.

Seek immediate medical advice if you develop severe headache with visual disturbance while taking Tetralysal, as this may indicate benign intracranial hypertension.

Seek urgent medical attention if you develop widespread skin blistering, peeling, or mucosal ulceration, as these may indicate a serious hypersensitivity reaction.

Contact your GP promptly if you develop severe abdominal pain, persistent diarrhoea, or jaundice during treatment.

Call 999 or attend A&E only if you experience signs of anaphylaxis such as difficulty breathing, swelling of the face, lips, tongue, or throat, or cardiovascular collapse.

Sources

• Tetralysal 300, Summary of Product Characteristics (EMC)
• Lymecycline, British National Formulary (BNF)
• NICE CKS: Acne Vulgaris
• British Association of Dermatologists, Acne Patient Information
• Acne, NHS
• MHRA Yellow Card Scheme