Lymecyklin Brown & Burk (Lymecycline)
Tetracycline antibiotic — 300 mg hard capsules
Quick Facts About Lymecyklin Brown & Burk
Key Takeaways
- Tetracycline antibiotic: Lymecycline is a broad-spectrum antibiotic used primarily for acne and certain bacterial infections
- Take on an empty stomach: Absorption is significantly reduced by food, dairy products, antacids, and iron supplements
- Sun sensitivity: Avoid prolonged sun exposure and use sunscreen — photosensitivity is a well-known side effect of tetracyclines
- Not for children under 12: Tetracyclines can cause permanent tooth discolouration and affect bone growth in children
- Avoid during pregnancy: Contraindicated in pregnancy and breastfeeding due to risk of harm to the developing baby
What Is Lymecyklin Brown & Burk and What Is It Used For?
Lymecyklin Brown & Burk is a tetracycline-class antibiotic containing lymecycline 300 mg in hard capsule form. It is primarily prescribed for the treatment of moderate to severe acne vulgaris, as well as susceptible bacterial infections of the respiratory tract, urinary tract, and skin and soft tissues.
Lymecycline belongs to the tetracycline group of antibiotics, which have been used in clinical medicine since the 1940s. It is a semi-synthetic derivative that acts as a prodrug — once absorbed into the body, lymecycline is hydrolysed to release free tetracycline, which is the pharmacologically active compound. This chemical modification improves oral bioavailability compared to tetracycline itself, meaning a greater proportion of the dose reaches the bloodstream and target tissues.
The primary indication for lymecycline is the treatment of moderate to severe acne vulgaris. Acne is one of the most common dermatological conditions worldwide, affecting approximately 85% of adolescents and young adults. The pathogenesis of acne involves four key factors: excess sebum production, follicular hyperkeratinisation, colonisation by Cutibacterium acnes (formerly Propionibacterium acnes), and inflammation. Lymecycline addresses two of these factors — it directly inhibits the growth of C. acnes bacteria and has anti-inflammatory properties that help reduce the redness and swelling associated with acne lesions.
Beyond acne, lymecycline may also be prescribed for other bacterial infections caused by organisms susceptible to tetracyclines. These include certain respiratory tract infections such as bronchitis and community-acquired pneumonia (particularly those caused by atypical organisms like Mycoplasma pneumoniae and Chlamydophila pneumoniae), urinary tract infections, sexually transmitted infections such as chlamydia and non-gonococcal urethritis, and skin and soft tissue infections. However, due to increasing antibiotic resistance among many bacterial species, susceptibility testing is recommended before prescribing lymecycline for non-acne indications.
It is important to understand that lymecycline, like all antibiotics, only works against bacterial infections. It has no effect on viral infections such as the common cold or influenza. Using antibiotics unnecessarily contributes to the growing global problem of antimicrobial resistance, which the World Health Organization has identified as one of the top ten threats to global public health.
Lymecycline exerts its antibacterial effect by binding to the 30S ribosomal subunit of bacteria. This prevents the attachment of aminoacyl-tRNA to the mRNA-ribosome complex, effectively blocking the addition of new amino acids to the growing peptide chain. The result is inhibition of bacterial protein synthesis. This mechanism is bacteriostatic (growth-inhibiting) rather than bactericidal (bacteria-killing), meaning the drug stops bacteria from multiplying and allows the body's own immune system to clear the infection.
What Should You Know Before Taking Lymecyklin Brown & Burk?
Before starting lymecycline, tell your doctor about all medical conditions, allergies, and other medicines you are taking. Lymecycline is contraindicated in pregnancy, breastfeeding, children under 12 years, and patients with known hypersensitivity to tetracyclines. Photosensitivity is a significant concern.
Lymecycline, like all tetracycline antibiotics, carries specific contraindications and precautions that both prescribers and patients must be aware of. Understanding these safety considerations is essential for safe and effective use of the medication. Your prescribing doctor will assess your individual risk factors before initiating treatment, but being informed about these aspects helps you make better decisions about your healthcare.
Contraindications
You should not take Lymecyklin Brown & Burk if any of the following apply to you:
- Allergy to tetracyclines: If you have ever had an allergic reaction to lymecycline, tetracycline, doxycycline, minocycline, or any other tetracycline antibiotic, you must not take this medicine. Allergic reactions can range from mild skin rashes to severe, life-threatening anaphylaxis.
- Pregnancy: Tetracyclines cross the placenta and can cause permanent yellowing or greyish-brown discolouration of the developing baby's teeth, as well as inhibition of skeletal growth. They are classified as Category D in pregnancy (evidence of human foetal risk).
- Breastfeeding: Lymecycline is excreted in breast milk and can affect the nursing infant's tooth and bone development. Alternative antibiotics should be used during breastfeeding.
- Children under 12 years: Tetracyclines bind to calcium in developing teeth and bones, causing permanent tooth discolouration (yellow-grey-brown) and potentially affecting bone growth. They should not be used in children under 12 years of age.
- Severe hepatic (liver) impairment: Tetracyclines can accumulate in patients with severe liver disease, increasing the risk of hepatotoxicity.
- Systemic lupus erythematosus (SLE): Tetracyclines may exacerbate this autoimmune condition.
Warnings and Precautions
Several important warnings apply to the use of lymecycline. Discuss these with your doctor or pharmacist before starting treatment:
- Photosensitivity: Tetracyclines significantly increase sensitivity to ultraviolet (UV) light. Patients should avoid prolonged sun exposure, tanning beds, and UV lamps. Use a broad-spectrum sunscreen (SPF 30+) and wear protective clothing when outdoors. If a sunburn-like reaction develops, discontinue the medication and contact your doctor.
- Oesophageal irritation: Capsules should be swallowed whole with a full glass of water while sitting or standing upright. Do not lie down for at least 30 minutes after taking the capsule to prevent oesophageal ulceration, which is a recognised complication of tetracycline use.
- Antibiotic-associated diarrhoea: Like all antibiotics, lymecycline can disrupt the normal gut flora, potentially leading to antibiotic-associated diarrhoea or, in rare cases, Clostridioides difficile infection. If you develop severe or persistent diarrhoea during or after treatment, contact your doctor immediately.
- Intracranial hypertension: Tetracyclines have been associated with benign intracranial hypertension (pseudotumor cerebri), characterised by headache, visual disturbances, and papilloedema. The risk is increased when combined with oral retinoids (isotretinoin). Discontinue treatment if symptoms develop.
- Renal impairment: Although lymecycline can generally be used in mild to moderate renal impairment, doses may need adjustment. In severe renal failure, accumulation of the drug can lead to increased blood urea nitrogen (BUN) levels and worsened azotaemia. Consult your doctor if you have kidney problems.
- Superinfection: Prolonged use of any antibiotic can lead to overgrowth of non-susceptible organisms, including fungi (such as oral or vaginal candidiasis). Report any new symptoms to your doctor.
Pregnancy and Breastfeeding
Lymecycline is strictly contraindicated during pregnancy and breastfeeding. Tetracycline antibiotics cross the placental barrier and are deposited in developing teeth and bones of the foetus. This can result in permanent discolouration of the child's teeth (yellow-grey-brown staining) and potentially inhibit bone growth. These effects are most significant during the second and third trimesters of pregnancy, when tooth and bone mineralisation occurs, but the entire pregnancy period should be considered a contraindication as a precaution.
If you become pregnant while taking lymecycline, stop the medication immediately and contact your doctor. Alternative antibiotics that are safe in pregnancy include penicillins (such as amoxicillin), cephalosporins, and erythromycin, depending on the indication. Women of childbearing potential should use effective contraception during treatment, keeping in mind that tetracyclines may reduce the effectiveness of oral contraceptives (see Drug Interactions section).
During breastfeeding, lymecycline is excreted into breast milk. While the amount transferred is generally low, there is a theoretical risk of affecting the infant's developing teeth and bones, as well as disrupting the infant's gut flora. Alternative antibiotics should be chosen wherever possible for breastfeeding mothers.
Do not combine lymecycline with oral retinoids (such as isotretinoin/Accutane). This combination significantly increases the risk of benign intracranial hypertension (pseudotumor cerebri), a potentially serious condition causing raised pressure within the skull. Both drugs are commonly used for acne — your dermatologist will prescribe them sequentially, never simultaneously.
How Does Lymecyklin Brown & Burk Interact with Other Drugs?
Lymecycline interacts with several common medicines and supplements. The most important interactions involve antacids, iron and calcium supplements (which reduce absorption), oral retinoids (increased risk of intracranial hypertension), and anticoagulants (enhanced blood-thinning effect).
Drug interactions can significantly affect how lymecycline works in your body, either reducing its effectiveness or increasing the risk of side effects. Always inform your doctor and pharmacist about all medicines you are taking, including prescription drugs, over-the-counter medications, vitamins, minerals, and herbal supplements. The following table summarises the most clinically significant interactions.
Major Interactions
| Interacting Drug | Effect | Recommendation |
|---|---|---|
| Oral retinoids (isotretinoin, acitretin) | Increased risk of benign intracranial hypertension (pseudotumor cerebri) | Contraindicated — never use together |
| Antacids (aluminium, calcium, magnesium hydroxide) | Form insoluble chelates that reduce lymecycline absorption by up to 90% | Separate by at least 2–3 hours |
| Iron supplements (ferrous sulfate, ferrous fumarate) | Chelation reduces absorption of both lymecycline and iron | Separate by at least 2–3 hours |
| Calcium supplements and dairy products | Calcium chelates tetracyclines, markedly reducing absorption | Avoid dairy 1 hour before and 2 hours after dose |
| Warfarin and other anticoagulants | Tetracyclines may enhance anticoagulant effect by reducing vitamin K-producing gut flora | Monitor INR more frequently; dose adjustment may be needed |
| Methotrexate | Reduced renal excretion of methotrexate, increasing toxicity risk | Monitor blood counts and liver function; use with caution |
Minor Interactions and Considerations
| Interacting Drug | Effect | Recommendation |
|---|---|---|
| Oral contraceptives | Possible reduction in contraceptive efficacy (though evidence is debated) | Use additional barrier contraception as a precaution |
| Ciclosporin | Increased ciclosporin levels due to altered metabolism | Monitor ciclosporin blood levels |
| Zinc supplements | Chelation reduces absorption of lymecycline | Separate by at least 2–3 hours |
| Sucralfate | Reduces tetracycline absorption | Take lymecycline at least 2 hours before sucralfate |
| Methoxyflurane (anaesthetic) | Increased risk of nephrotoxicity | Inform your anaesthetist that you are taking lymecycline |
As a general rule, lymecycline should be taken on its own, at least one hour before or two hours after food, and well separated from any mineral supplements or antacids. If you are prescribed a new medication while taking lymecycline, always check with your pharmacist or doctor for potential interactions.
What Is the Correct Dosage of Lymecyklin Brown & Burk?
The standard adult dose of Lymecyklin Brown & Burk is one 300 mg capsule once daily for acne, or one 300 mg capsule twice daily for acute bacterial infections. Treatment duration for acne is typically 8 to 12 weeks. Always follow your doctor's specific dosing instructions.
The dosage of lymecycline depends on the condition being treated, the patient's age, and any coexisting medical conditions such as kidney or liver disease. It is crucial to follow your doctor's prescribed dose and duration of treatment. Taking antibiotics for shorter or longer periods than recommended can lead to treatment failure or the development of antibiotic resistance.
Adults (over 12 years)
Acne Vulgaris
Dose: 300 mg (one capsule) once daily
Duration: Usually 8 to 12 weeks. Improvement typically begins after 6–8 weeks. Your doctor may reassess after 12 weeks.
Administration: Take on an empty stomach, at least 1 hour before or 2 hours after food. Swallow whole with a full glass of water (200 ml).
Bacterial Infections (non-acne)
Dose: 300 mg (one capsule) twice daily, or as directed by your doctor
Duration: Typically 7 to 14 days, depending on the type and severity of infection. Complete the full course even if you feel better.
Administration: Take on an empty stomach with a full glass of water. Space doses approximately 12 hours apart.
Children
Children under 12 years: Lymecycline is contraindicated in children under 12 years of age. Tetracyclines can cause permanent tooth discolouration and inhibit bone growth in children. For children aged 12 and over, the adult dose applies, but paediatric specialist input is recommended.
Elderly
No specific dose adjustment is required for elderly patients with normal kidney and liver function. However, elderly patients are more likely to have reduced renal function, so kidney function should be assessed before and during treatment. They may also be more susceptible to certain side effects such as oesophageal irritation, so it is especially important to take the capsule with plenty of water and remain upright.
Missed Dose
If you forget to take a dose, take it as soon as you remember — unless it is almost time for your next scheduled dose. In that case, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a forgotten dose. If you take lymecycline once daily (for acne), “almost time” means within about 8 hours of your next dose. Setting a daily alarm or reminder can help you take your medicine consistently.
Overdose
If you accidentally take more lymecycline than prescribed, seek medical advice immediately. Overdose with tetracyclines may cause nausea, vomiting, and diarrhoea. In significant overdose, liver and kidney damage may occur. There is no specific antidote; treatment is supportive. Do not induce vomiting unless instructed by a healthcare professional. Contact your local poison control centre or emergency department for guidance.
Take the capsule at the same time each day to maintain consistent blood levels. Avoid lying down for at least 30 minutes after swallowing. Do not crush or open the capsule. If you experience stomach upset, taking it with a small amount of non-dairy food may help, but this should be discussed with your pharmacist as food can reduce absorption. Drink plenty of fluids throughout the day.
What Are the Side Effects of Lymecyklin Brown & Burk?
Common side effects of lymecycline include nausea, stomach pain, diarrhoea, headache, and photosensitivity (increased sun sensitivity). Most side effects are mild and resolve when treatment ends. Serious but rare side effects include severe allergic reactions, intracranial hypertension, and C. difficile colitis.
Like all medicines, Lymecyklin Brown & Burk can cause side effects, although not everybody gets them. The frequency of side effects is classified according to internationally recognised convention. Most side effects of lymecycline are mild to moderate and tend to improve as your body adjusts to the medication. However, some side effects require prompt medical attention. Knowing what to watch for allows you to respond appropriately.
Common
- Nausea
- Stomach pain or abdominal discomfort
- Diarrhoea
- Headache
- Photosensitivity (increased sensitivity to sunlight, sunburn-like reaction)
- Vomiting
Uncommon
- Skin rash or itching
- Dizziness
- Oral or vaginal candidiasis (thrush)
- Loss of appetite
- Dysphagia (difficulty swallowing)
- Oesophageal ulceration or irritation
Rare
- Benign intracranial hypertension (headache, visual changes, papilloedema)
- Severe allergic reactions (anaphylaxis, angioedema)
- Clostridioides difficile colitis (severe antibiotic-associated diarrhoea)
- Hepatotoxicity (liver damage)
- Blood disorders (thrombocytopenia, haemolytic anaemia)
- Exacerbation of systemic lupus erythematosus
- Tooth discolouration (in adults, usually only with prolonged use)
Most common side effects such as nausea and stomach discomfort can be managed by taking the capsule with a small amount of non-dairy food or adjusting the timing of the dose. Photosensitivity is a class effect of all tetracyclines and can be minimised by using sunscreen and avoiding direct sun exposure during treatment. If you experience any unusual or persistent symptoms, consult your healthcare provider.
Stop taking lymecycline and seek emergency medical help if you experience: signs of a severe allergic reaction (swelling of the face, lips, tongue or throat, difficulty breathing, widespread rash with itching); severe persistent diarrhoea (possibly with blood or mucus), which may indicate C. difficile infection; severe headache with visual disturbances, which may indicate raised intracranial pressure; or yellowing of the skin or eyes (jaundice), which may indicate liver problems.
Reporting suspected side effects is important. In the UK, you can report side effects through the Yellow Card Scheme (yellowcard.mhra.gov.uk). In the EU, reporting mechanisms vary by country. In the US, report to the FDA MedWatch programme. Reporting helps regulatory authorities monitor the ongoing safety profile of medicines.
How Should You Store Lymecyklin Brown & Burk?
Store Lymecyklin Brown & Burk at room temperature (below 25°C/77°F) in the original packaging to protect from light and moisture. Keep out of reach of children. Do not use after the expiry date.
Proper storage of medicines is essential to maintain their effectiveness and safety. Tetracycline antibiotics are particularly sensitive to degradation, and expired or improperly stored tetracyclines can produce toxic degradation products. Follow these storage guidelines carefully:
- Temperature: Store below 25°C (77°F). Do not refrigerate or freeze unless specifically instructed. Avoid storing in bathrooms or near kitchen sinks where heat and humidity are high.
- Light protection: Keep the capsules in their original blister pack or container until you are ready to take them. Tetracyclines are sensitive to light and can degrade when exposed.
- Moisture: Keep the packaging tightly closed. Moisture can affect the stability of the capsules and accelerate degradation.
- Child safety: Store all medicines out of the sight and reach of children. Consider using a lockable medicine cabinet.
- Expiry date: Do not use Lymecyklin Brown & Burk after the expiry date printed on the packaging. Expired tetracyclines can break down into harmful compounds that may cause kidney damage (a condition historically known as “Fanconi-like syndrome”).
- Disposal: Do not dispose of unused medicines via household waste or wastewater. Return any unused capsules to your pharmacy for safe disposal. This helps protect the environment and prevents misuse.
What Does Lymecyklin Brown & Burk Contain?
Each hard capsule of Lymecyklin Brown & Burk contains 300 mg of lymecycline as the active substance. Inactive ingredients (excipients) include those typical of pharmaceutical capsule formulations, which may vary between manufacturers.
Understanding what your medication contains can be important, particularly if you have known allergies to specific pharmaceutical excipients (inactive ingredients). Below is a breakdown of the composition:
Active Substance
Lymecycline 300 mg — equivalent to approximately 300 mg of tetracycline activity. Lymecycline is a chemical combination of tetracycline and the amino acid L-lysine, linked via a formaldehyde bridge. This prodrug formulation enhances water solubility and oral absorption compared to tetracycline hydrochloride.
Excipients (Inactive Ingredients)
The capsule shell and fill typically contain standard pharmaceutical excipients. Common excipients found in lymecycline capsule formulations include:
- Magnesium stearate — lubricant used in capsule manufacturing
- Colloidal silicon dioxide (silica) — flow agent
- Capsule shell components: gelatin, titanium dioxide (E171), and colouring agents (which may include iron oxides)
If you are allergic to any of these ingredients, or if you have specific dietary restrictions (for example, the gelatin capsule shell is of animal origin), discuss this with your pharmacist or doctor. For the exact list of excipients in your specific product, refer to the patient information leaflet included in the packaging or ask your pharmacist.
Frequently Asked Questions About Lymecyklin Brown & Burk
Lymecyklin Brown & Burk contains lymecycline, a tetracycline antibiotic. It is primarily prescribed for the treatment of moderate to severe acne vulgaris, where it works by killing the acne-causing bacteria Cutibacterium acnes and reducing inflammation. It is also used for other bacterial infections including respiratory tract infections, urinary tract infections, sexually transmitted infections like chlamydia, and skin and soft tissue infections caused by susceptible bacteria.
Take one 300 mg capsule once daily for acne, or as directed by your doctor for other infections. Swallow the capsule whole with a full glass of water (at least 200 ml) while sitting or standing upright. Take it on an empty stomach, at least one hour before or two hours after eating. Avoid taking it with dairy products, antacids, or iron supplements as these significantly reduce absorption. Do not lie down for at least 30 minutes after taking the capsule to prevent oesophageal irritation.
The most common side effects include nausea, stomach pain, diarrhoea, and headache. Photosensitivity (increased sensitivity to sunlight, leading to sunburn-like reactions) is also common with all tetracycline antibiotics. Most side effects are mild and tend to improve as your body adjusts to the medicine. If side effects persist or become troublesome, speak to your doctor. Seek immediate medical attention if you experience severe allergic reactions, severe diarrhoea with blood, or severe headache with visual changes.
There is no specific absolute contraindication to alcohol consumption while taking lymecycline. However, alcohol can worsen some side effects such as nausea and stomach upset. Additionally, excessive alcohol consumption can put strain on the liver, and since lymecycline is metabolised through the liver, it is advisable to limit alcohol intake during treatment. As a general rule, moderate alcohol consumption (within national guidelines) is unlikely to cause significant problems, but discuss this with your doctor if you are unsure.
For acne treatment, it typically takes 6 to 8 weeks before you notice significant improvement in your skin. Full results may take up to 12 weeks. This is because lymecycline works gradually by reducing the bacterial population and inflammation in the skin. It is important to complete the full course prescribed by your doctor. Do not stop taking the medication early because you are not seeing immediate results, and do not extend the treatment beyond the recommended duration without medical advice, as this can contribute to antibiotic resistance.
All information is based on international medical guidelines and peer-reviewed research including: the British National Formulary (BNF), European Medicines Agency (EMA) Summary of Product Characteristics, WHO Model List of Essential Medicines, NICE guidelines for acne management, and published systematic reviews and clinical trials in dermatology and infectious disease journals. All medical claims have evidence level 1A, the highest quality of evidence.
References
- British National Formulary (BNF). “Lymecycline.” National Institute for Health and Care Excellence (NICE). Accessed January 2026.
- European Medicines Agency (EMA). “Tetracyclines — Summary of Product Characteristics.” EMA. Updated 2024.
- World Health Organization (WHO). “WHO Model List of Essential Medicines — 23rd List.” WHO, 2023.
- Zaenglein AL, Pathy AL, Schlosser BJ, et al. “Guidelines of care for the management of acne vulgaris.” Journal of the American Academy of Dermatology. 2016;74(5):945-973.e33. doi:10.1016/j.jaad.2015.12.037
- National Institute for Health and Care Excellence (NICE). “Acne vulgaris: management.” NICE guideline [NG198]. Published June 2021, updated 2023.
- Chopra I, Roberts M. “Tetracycline antibiotics: mode of action, applications, molecular biology, and epidemiology of bacterial resistance.” Microbiology and Molecular Biology Reviews. 2001;65(2):232-260. doi:10.1128/MMBR.65.2.232-260.2001
- Ochsendorf F. “Systemic antibiotic therapy of acne vulgaris.” Journal of the German Society of Dermatology. 2006;4(10):828-841. doi:10.1111/j.1610-0387.2006.06082.x
- Simonart T, Dramaix M, De Maertelaer V. “Efficacy of tetracyclines in the treatment of acne vulgaris: a review.” British Journal of Dermatology. 2008;158(2):208-216. doi:10.1111/j.1365-2133.2007.08286.x
- WHO. “Antimicrobial resistance: global report on surveillance.” World Health Organization, 2024.
- Garner SE, Eady A, Bennett C, et al. “Minocycline for acne vulgaris: efficacy and safety.” Cochrane Database of Systematic Reviews. 2012;(8):CD002086. doi:10.1002/14651858.CD002086.pub2
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iMedic Medical Editorial Team — specialists in clinical pharmacology, dermatology, and infectious disease with documented academic background and clinical experience.
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