Isotretinoin Actavis (Isotretinoin)

Isotretinoin is a retinoid used in dermatology to treat severe forms of acne that are unresponsive to conventional therapy.

• Severe nodular acne: reduces the number and size of nodules and promotes clearance of inflammatory lesions.
• Acne vulgaris refractory to other treatments: achieves significant improvement in lesion count when other medications have failed.
• Moderate to severe acne: helps to control persistent breakouts and prevent scarring.

• Isotretinoin binds to nuclear retinoic acid receptors (RARs) and retinoid X receptors (RXRs), altering gene transcription that leads to decreased sebaceous gland size, reduced sebum output, normalization of follicular keratinization, and anti‑inflammatory effects, thereby limiting the formation of comedones and inflammatory lesions.

Isotretinoin may cause a range of adverse reactions, which are categorized by frequency and severity.

Common Side Effects

• Dry skin and lips: increased transepidermal water loss causing xerosis and cheilitis.
• Nasal mucosa dryness: leading to epistaxis or crusting.
• Elevated triglycerides: mild to moderate hyperlipidaemia.
• Headache: transient tension‑type headaches.
• Photosensitivity: heightened skin reaction to sunlight.

Serious or Rare Side Effects

• Teratogenicity: severe birth defects if exposure occurs during pregnancy.
• Depression or suicidal ideation: mood alterations requiring immediate evaluation.
• Inflammatory bowel disease: new‑onset or exacerbation of Crohn's disease or ulcerative colitis.
• Liver toxicity: significant elevation of transaminases.
• Pseudotumor cerebri: increased intracranial pressure presenting with visual disturbances.
• Severe hypertriglyceridaemia: may precipitate pancreatitis.

When prescribing isotretinoin, clinicians should observe several safety measures to minimize risks.

• Pregnancy: contraindicated; ensure effective contraception before, during, and after therapy.
• Teratogenic risk: avoid use in women of childbearing potential.
• Baseline labs: monitor liver enzymes and lipid profile prior to initiation and periodically during treatment.
• Psychiatric monitoring: watch for mood changes, depression, or suicidal ideation.
• Vision: advise patients to report visual disturbances promptly.
• Store at ambient temperature below 25°C: keep in original container, protect from moisture and light.

Isotretinoin interacts with several medicines; some combinations should be avoided while others require careful monitoring.

Major Interactions (Avoid)

• Tetracyclines: increased risk of intracranial hypertension.
• Vitamin A supplements: additive retinoid toxicity.
• Systemic corticosteroids: may reduce isotretinoin efficacy.
• Combined oral contraceptives: potential for increased thrombotic risk.

Moderate Interactions (Monitor Closely)

• Macrolide antibiotics (e.g., erythromycin): may affect hepatic metabolism.
• Azole antifungals (e.g., ketoconazole): can raise isotretinoin plasma levels.
• Lipid‑lowering agents (e.g., fibrates): monitor triglyceride levels closely.