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Tretiva

What is Tretiva?

Tretiva is a prescription pill that contains isotretinoin as its sole active ingredient. Isotretinoin belongs to the skin-care therapeutic class of retinoids and is used primarily for severe acne that has not responded to other treatments. In Hong Kong, Tretiva is available by prescription only and is supplied in 5 mg, 10 mg, 20 mg, and 30 mg strengths.

How Tretiva Works in the Body

Isotretinoin is a synthetic derivative of vitamin A. It works by:

• Reducing the size and activity of sebaceous (oil) glands, which lowers skin oil production.
• Normalising the shedding of skin cells within hair follicles, preventing the formation of clogged pores.
• Decreasing inflammation through modulation of immune responses.

These actions together lead to fewer acne lesions, reduced redness, and improvement of skin texture. The drug is well absorbed after oral administration, reaches peak plasma concentrations within 4-6 hours, and is metabolised primarily by the liver before being excreted in the urine and feces.

Conditions Treated by Tretiva

• Severe recalcitrant nodular or cystic acne that has not improved with topical agents or oral antibiotics.
• Tretiva is approved for this indication by regulatory agencies that oversee prescription medicines in Hong Kong. Use in milder forms of acne is considered off-label and should be guided by a dermatologist.

Patient Suitability and Contraindications

Who Should Use Tretiva?

• Individuals with severe nodular or cystic acne unresponsive to conventional therapy.
• Patients who can commit to regular monitoring of liver function, lipid levels, and pregnancy status.

Absolute Contraindications

• Known hypersensitivity to isotretinoin or any component of the pill.
• Pregnancy or potential for pregnancy (isotretinoin is highly teratogenic).
• Breast-feeding.
• Pre-existing severe liver disease or uncontrolled hyperlipidaemia.

Relative Contraindications

• Mild to moderate liver enzyme elevation.
• History of severe depression or psychiatric disorders (requires careful assessment).
• Renal impairment (dose may need adjustment).
• Use of tetracycline antibiotics (increased risk of intracranial hypertension).

Special Populations

• Pregnancy: Women of child-bearing potential must use effective contraception before, during, and for at least one month after completing therapy.
• Pediatric: Isotretinoin is generally not recommended for patients under 12 years of age.
• Geriatric: Start with lower doses and monitor closely for adverse effects.

Safety Profile: Side Effects and Interactions

Common Side Effects

• Dry skin, lips, and mucous membranes (often reported as the most frequent complaint).
• Mild itching or peeling of the skin.
• Transient worsening of acne during the first weeks of therapy.

Serious Adverse Events

• Teratogenicity: Birth defects can occur if isotretinoin exposure happens during pregnancy.
• Elevated liver enzymes and hyperlipidaemia may require dose adjustment or discontinuation.
• Depression, suicidal ideation, or psychosis have been reported; patients should seek immediate help if mood changes occur.

Drug Interactions

• Tetracycline antibiotics (e.g., doxycycline) - increased risk of intracranial hypertension.
• Vitamin A supplements - additive toxicity, may worsen side-effects.
• Concomitant use of systemic steroids - can affect the therapeutic response.

Patients should inform their healthcare provider of all prescription medicines, over-the-counter drugs, supplements, and herbal products before starting Tretiva.

Food and Lifestyle Interactions

• Isotretinoin can be taken with or without food; however, taking it with a low-fat meal may modestly reduce absorption.
• Alcohol consumption should be limited, as both alcohol and isotretinoin can stress liver function.
• Sun protection is advisable because isotretinoin can increase skin sensitivity to ultraviolet light.

How to Take Tretiva

• Standard dosing: Typically 0.5 mg/kg body weight per day, divided into two doses, for a total daily dose of 20-30 mg. The exact dosage is chosen from the available strengths (5 mg, 10 mg, 20 mg, 30 mg) and adjusted by the prescribing clinician.
• Treatment duration: Courses usually last 15-20 weeks, aiming for a cumulative dose of 120-150 mg/kg to reduce recurrence risk.
• Special populations: Dose reductions are recommended for patients with liver enzyme elevation, high triglycerides, or renal impairment.
• Administration: Swallow the pill whole with a glass of water. Do not crush, split, or chew unless explicitly instructed.
• Missed dose: Take the missed dose as soon as remembered if it is at least 8 hours before the next scheduled dose; otherwise skip it and resume the regular schedule. Do not double the dose.
• Overdose: Symptoms may include severe headache, nausea, vomiting, dizziness, and visual disturbances. Seek emergency medical care; activated charcoal may be considered if presentation is early.
• Discontinuation: Abrupt cessation is generally safe, but a healthcare provider may advise a tapering schedule in rare cases of significant side effects.

Monitoring and Follow-Up

• Baseline labs before initiating therapy: liver function tests (ALT, AST), fasting lipid profile, and pregnancy test for women of child-bearing potential.
• During treatment: Repeat liver enzymes and lipid panel every 4-6 weeks. Pregnancy tests are required monthly for women.
• Clinical review: Dermatologic assessment every 4-6 weeks to evaluate acne response and side-effect burden.
• Long-term follow-up: After completing therapy, periodic skin examinations are advised to monitor for acne recurrence.

Storage and Handling

• Store Tretiva tablets at room temperature (15-30 °C), away from excess moisture and direct sunlight.
• Keep the container tightly closed and out of reach of children.
• Do not use the medication after the expiration date printed on the packaging.
• For safe disposal, return unused tablets to a pharmacy or follow local hazardous waste guidelines.

Medication-Specific Glossary

Teratogenic

A property of a substance that can cause birth defects when a pregnant woman is exposed.

Cumulative Dose

The total amount of isotretinoin taken over the entire course of therapy, often expressed in mg/kg, linked to long-term effectiveness and relapse risk.

Retinoid

A class of compounds chemically related to vitamin A that influence skin cell growth, differentiation, and oil production.

Medical Disclaimer

This article provides educational information about Tretiva and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.