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Tetralysal 300mg Hard Capsules

Active Ingredient:
Galderma (U.K) Ltd See contact details
ATC code: 
About Medicine
{healthcare_pro_orange} This information is for use by healthcare professionals
Last updated on emc: 28 Nov 2022
1. Name of the medicinal product

Tetralysal 300 mg Hard Capsules

2. Qualitative and quantitative composition

Each capsule contains 408 mg of Lymecycline equivalent to 300 mg tetracycline base

For the full list of excipients, see section 6.1

3. Pharmaceutical form

Hard capsule

Hard gelatin capsule, red cap and yellow body

4. Clinical particulars
4.1 Therapeutic indications

Tetralysal is indicated for the treatment of infections caused by tetracycline sensitive organisms (please see section 4.4 and 5.1) including the following:

• Acne

• Ear, nose and throat infections

• Acute exacerbation of chronic bronchitis

• Gastro-intestinal infection

• Urinary tract infection

• Non-gonococcal urethritis

• Trachoma

• Rickettsial fever

• Soft tissue infection

Consideration should be given to official guidance on the appropriate use of antibacterial agents.

4.2 Posology and method of administration


The usual dosage for the chronic treatment of acne is 1 capsule daily (300 mg/day): treatment should be continued for at least 8 weeks.

For other infections, the usual dosage is 1 capsule b.d. (600 mg/day). If higher doses are required, 3-4 capsules (900-1200 mg) may be given over 24 hours. Lower doses may be given for prophylaxis.

In the management of sexually transmitted disease both partners should be treated.


As for other tetracyclines, no specific dose adjustment is required.

Paediatric population:

The safety and efficacy of Tetralysal in children aged under 12 years of age have not been established. No data are available.

For children over the age of 12 years, the adult dosage may be given.

For children under the age of 8 years, see section 4.3.

Methods of administration

The capsules should be taken with a glass of water in order to reduce the risk of oesophageal irritation and ulceration (see section Special warnings and precautions for use).

4.3 Contraindications

Hypersensitivity to the active substance or any other tetracycline or to any of the excipients listed in section 6.1.

Its use is contraindicated in patients with overt renal insufficiency and in children aged under 8 years due to the risk of permanent dental staining and enamel hypoplasia.

Concurrent treatment with oral retinoids (see Interaction with other Medications).

4.4 Special warnings and precautions for use

Oesophageal irritation and ulceration

Solid dosage forms of the tetracyclines may cause oesophageal irritation and ulceration. To avoid oesophageal irritation and ulceration, adequate fluids (water) should be taken with this medicinal product (see section Posology and method of administration).

Caution should be exercised if the product is administered to patients with impaired renal or hepatic functions.


Overdosage could result in hepatotoxicity

Antibiotic resistance

Prolonged use of broad spectrum antibiotics may result in the appearance of resistant organisms and superinfection.


Due to the risks of photosensitivity, it is recommended to avoid exposure to direct sunlight and ultraviolet light during the treatment which should be discontinued if erythematous cutaneous manifestations occur.

Expired medication

The use of expired tetracyclines can lead to renal tubular acidosis (Pseudo-Fanconi syndrome) readily reversible when treatment is discontinued altogether.

Systemic lupus erythematosus

May cause exacerbation of systemic lupus erythematosus.

Myasthenia Gravis

Can cause weak neuromuscular blockade so should be used with caution in Myasthenia Gravis.

Hepatic impairment

Care should be exercised when administering tetracyclines to patients with hepatic impairment.

Paediatric population

The product should not be used in children below 12 years of age due to the risk of permanent dental staining and enamel hypoplasia (see Contraindications).

4.5 Interaction with other medicinal products and other forms of interaction

Simultaneous administration of iron preparations and anti-acids, magnesium/aluminium and calcium hydroxides, oxides, salts, cholestyramine, bismuth chelates, sucralfate and quinapril may decrease cycline absorption. Enzyme inducers such as barbiturates, carbamazepine, phenytoin may accelerate the decomposition of tetracycline due to enzyme induction in the liver thereby decreasing its half-life. These products should not be taken within two hours before or after taking Tetralysal 300.

Some adverse effects are reported with tetracycline therapy in general in case of combination with lithium; an interaction between lithium and the tetracycline class is a recognised interaction. A combination of lymecycline with lithium may cause an increase in serum lithium levels.

Unlike earlier tetracyclines, absorption of Tetralysal 300 is not significantly impaired by moderate amounts of milk.

Concomitant use of oral retinoids and vitamin A (above 10 000 IU/day) should be avoided as this may increase the risk of benign intracranial hypertension. An increase in the effects of anticoagulants may occur with tetracyclines with an increased risk of haemorrhage. Concomitant use of diuretics should be avoided.

Bacteriostatic medicinal products including lymecycline may interfere with the bacteriocidal action of penicillin and beta-lactam antibiotics. It is advisable that tetracycline-class drugs and penicillin should not therefore be used in combination.

Tetracyclines and methoxyflurane used in combination have been reported to result in fatal renal toxicity.

Paediatric population

Interaction studies have only been performed in adults.

4.6 Fertility, pregnancy and lactation

Tetracyclines are selectively absorbed by developing bones and teeth and may cause dental dyschromia and enamel hypoplasia (see section 4.3).


Tetracyclines readily cross the placental barrier. Therefore, Tetralysal 300 should not be administered to pregnant women.


Tetracyclines are distributed into milk. Therefore, Tetralysal 300 should not be administered to breast-feeding women (risk of enamel hypoplasia or dental dyschromia in the infant) (see section 4.3).


No data on the effect on fertility is available.

4.7 Effects on ability to drive and use machines

No studies on the effects on the ability to drive and use machines have been performed

4.8 Undesirable effects

Tabulated list of adverse reactions

The most frequently reported adverse events with Tetralysal are gastrointestinal disorders of nausea, abdominal pain, diarrhoea and nervous system disorder of headache. The most serious adverse events reported with Tetralysal are Stevens Johnson syndrome, anaphylactic reaction, angioneurotic oedema and intracranial hypertension.

System Organ Class


Adverse Reaction

Blood and lymphatic system disorders




Eye disorders


Visual disturbance*

Gastrointestinal disorders


(≥ 1/100 and <1/10)


Abdominal pain







General disorders and administration site conditions



Hepatobiliary disorders




Immune system disorder


Anaphylactic reaction



Angioneurotic oedema



Transaminases increased

Blood alkaline phosphatase increased

Blood bilirubin increased

Nervous system disorders


(≥ 1/100 and <1/10)




Intracranial hypertension

Skin and subcutaneus tissues disorders


Erythematous rash



Stevens Johnson syndrome

Psychiatric disorders




Description of selected adverse reactions

*The manifestation of clinical symptoms, including vision disorders, or headache, must suggests the possibility of a cranial hypertension diagnosis. If increased intracranial pressure is suspected during treatment with Tetralysal, administration should be stopped.

Benign intracranial hypertension and bulging fontanelles in infants were reported with tetracyclines with possible symptoms of headaches, vomiting, visual disturbances including blurring of vision, scotomata, diplopia or permanent visual loss.

The following adverse effects were reported with tetracyclines in general and may occur with Tetralysal: dysphagia, oesophagitis, oesophageal ulceration, systemic lupus erythematosus, pancreatitis, teeth discolouration, hepatitis, hepatic failure. Dental dyschromia and/or enamel hypoplasia may occur if the product is administered in children younger than 8 years of age.

As with all antibiotics overgrowth of non susceptible organisms may cause candidiasis, pseudomembranous colitis (Clostridium Difficile overgrowth), glossitis, stomatitis, vaginitis or staphyloccocal enterocolitis.

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product.

Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme. Website: or search for MHRA Yellow Card in the Google Play or Apple App Store

4.9 Overdose


Acute overdosage is rare with antibiotics and there is no specific treatment.


Supportive measure should be instituted as required and a high fluid intake maintained.

5. Pharmacological properties
5.1 Pharmacodynamic properties

Pharmacotherapeutic group: Tetracyclines

ATC code: J01AA04

Mode of action

Tetracyclines provide bacteriostatic action at the available plasma and tissue concentrations and are effective against intracellular and extracellular organisms. Their mechanism of action is based on an inhibition of ribosomal protein synthesis. Tetracyclines block the access of the bacterial aminoacyl-tRNA to the mRNA-ribosome complex by binding to the 30S subunit of the ribosome, thus preventing the addition of amino acids to the growing peptide chain in protein synthesis. When given at therapeutically attainable concentrations their toxic effect is limited to the bacterial cells.

The exact mechanisms by which tetracyclines reduce lesions of acne vulgaris have not been fully elucidated; however, the effect appears to result in part from the antibacterial activity of the drugs. Following oral administration, the drugs inhibit the growth of susceptible organisms (mainly Propionibacterium acnes) on the surface of the skin and reduce the concentration of free fatty acids in sebum. The reduction in free fatty acids in sebum may be an indirect result of the inhibition of lipase-producing organisms which convert triglycerides into free fatty acids or may be a direct result of interference with lipase production in these organisms. Free fatty acids are comedogenic and are believed to be a possible cause of the inflammatory lesions, e.g. papules, pustules, nodules, cysts, of acne. However, other mechanisms also appear to be involved because clinical improvement of acne vulgaris with oral tetracycline therapy does not necessarily correspond with a reduction in the bacterial flora of the skin or a decrease in the free fatty acid content of sebum.

Mechanism of resistance

Tetracycline resistance in propionibacteria is usually associated with a single point mutation within the gene encoding 16S rRNA. Clinical isolates resistant to tetracycline were found to have cytosine instead of guanine at a position cognate with Escherichia coli base 1058. There is no evidence that ribosome mutations can be transferred between different strains or species of propionibacteria, or between propionibacteria and other skin commensals.

Resistance to the tetracyclines is associated with mobile resistance determinants in both staphylococci and coryneform bacteria. These determinants are potentially transmissible between different species and even different genera of bacteria.

In all three genera, cross-resistance with the macrolide-lincosamide-streptogramin group of antibiotics cannot be ruled out.

Strains of propionibacteria resistant to the hydrophilic tetracyclines are cross-resistant to doxycycline and may or may not show reduced susceptibility to minocycline.


For tetracycline resistance in anaerobic and most aerobic bacteria, the breakpoints as set by the NCCLS are:




MIC < 4 mg/L

MIC 8 mg/L

MIC > 16 mg/L

In cutaneous propionibacteria, mutational resistance is associated with MICs of tetracycline > 2mg/L.

Susceptibility table

The prevalence of acquired resistance may vary geographically and with time for selected species and local information on resistance is desirable, particularly when treating severe infections. As necessary, expert advice should be sought when the local prevalence of resistance is such that the utility of the agent in at least some types of infections is questionable.

Susceptibility to tetracyclines of species relevant to the approved indication

Commonly susceptible species

Gram-positive aerobes

None of relevance

Gram-negative aerobes

None of relevance


Propionbacterium acnes (clinical isolates)*


None of relevance

Species for which acquired resistance may be a problem (defined as >10% resistant within any European country)

Gram-positive aerobes

S. aureus (methicillin susceptible)

S. aureus (methicillin resistant) +

Coagulase-negative staphylococci (methicillin susceptible)

Coagulase-negative staphylococci (methicillin resistant) +

Corynebacterium spp

Species for which acquired resistance may be a problem (defined as >10% resistant within any European country)

Gram-negative aerobes

None of relevance


Propionibacterium acnes (isolates from acne)* +

Other (microaerophile)

None of relevance

Inherently resistant species

None of relevance

However, even if resistance to cutaneous propionibacteria is detected, this does not automatically translate into therapeutic failure, since the antiinflammatory activity of the tetracyclines is not compromised by resistance in the target bacteria.

5.2 Pharmacokinetic properties

Lymecycline is more readily absorbed from the gastro-intestinal tract than tetracycline, with a peak serum concentration of approximately 2mg/L after 3 hours following a 300 mg dose. In addition, similar blood concentrations are achieved with small doses. When the dose is doubled an almost correspondingly higher blood concentration has been reported to occur.

The serum half-life of lymecycline is approximately 10 hours.

5.3 Preclinical safety data

No specific information is presented given the vast experience gained with the use of tetracyclines in humans over the last forty years.

6. Pharmaceutical particulars
6.1 List of excipients

Magnesium stearate

Colloidal hydrated silica

The capsule shells contain:


titanium dioxide (E171)

erythrosine (E127)

quinoline yellow (E104)

indigotine (E132)

6.2 Incompatibilities

Not applicable

6.3 Shelf life

3 years (unopened)

6.4 Special precautions for storage

Aluminium and polyethylene strips:

Do not store above 25° C.

Store in the original container.

Aluminium-PVC/PVDC calendar blister strips:

Do not store above 25° C.

Keep container in the outer carton.

As with all medicines, Tetralysal 300 should be kept out of the sight and reach of children.

6.5 Nature and contents of container

Aluminium-PVC/PVDC calendar blister strips of 14 capsules; two strips per carton, pack size = 28 capsules or Aluminium and polyethylene strips 28 or 56 capsule pack size.

Not all pack sizes may be marketed.

6.6 Special precautions for disposal and other handling

No special requirements

Any unused medicinal product or waste material should be disposed of in accordance with local requirements.

7. Marketing authorisation holder

Galderma (UK) Limited

Evergreen House North

Grafton Place



United Kingdom

8. Marketing authorisation number(s)

PL 10590/0019

9. Date of first authorisation/renewal of the authorisation

29th September 1995

10. Date of revision of the text

4th October 2022

Galderma (U.K) Ltd
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Evergreen House North, Grafton Place, London, NW1 2DX, UK
+44 (0)300 3035674
Medical Information e-mail
[email protected]