Isotretinoin (Oral) — NZ Medication Guide
📋 Reviewed by a Registered Pharmacist NZ — This information is for general educational purposes only and does not replace professional medical advice. Always consult your doctor or pharmacist before starting, stopping, or changing any medication.
What is Isotretinoin (Oral)?
Oral isotretinoin (13-cis-retinoic acid) is a systemic retinoid used for severe, recalcitrant acne vulgaris. This medication is funded by Pharmac under Special Authority for severe acne with strict Pregnancy Prevention Programme.
What is Isotretinoin (Oral) Used For?
Oral isotretinoin (Roaccutane® in NZ) is used for severe nodulocystic or conglobate acne, moderate acne that has not responded adequately to courses of oral antibiotics and topical treatment, and acne causing significant scarring.
How Does Isotretinoin (Oral) Work?
Isotretinoin has multiple mechanisms that collectively produce a lasting remission of acne: markedly reduces sebum production (by >90%), reduces follicular cornification (comedone formation), inhibits C. acnes colonisation indirectly, and reduces inflammation.
How to Take Isotretinoin (Oral)
Taken orally with food (fat significantly improves absorption). Dose is weight-based: typically 0.5 mg/kg/day initially, increased to 1 mg/kg/day as tolerated. Standard course: 4–6 months (cumulative dose of 120–150 mg/kg). Regular monitoring of LFTs, fasting lipids, and FBC required.
Common Side Effects of Isotretinoin (Oral)
- Cheilitis (dry, cracked lips — almost universal — use lip balm diligently)
- Dry skin, eyes, and nasal mucosa
- Photosensitivity
- Myalgia and arthralgia
- Nosebleeds
- Raised triglycerides and cholesterol (monitoring required)
- Elevated liver enzymes
Serious Side Effects — Seek Medical Attention
Contact your doctor or call 111 immediately if you experience any of the following:
- Teratogenicity (SEVERE — causes major congenital abnormalities in virtually all exposed fetuses; mandatory Pregnancy Prevention Programme — pregnancy test before, monthly during, and 1 month after treatment)
- Depression and suicidal ideation (reported — monitor mood throughout)
- Inflammatory bowel disease (rare — association debated)
- Night blindness (rare)
- Severe skin reactions
- Pseudotumor cerebri (intracranial hypertension — avoid with tetracyclines)
Drug Interactions
Isotretinoin (Oral) may interact with other medicines. Always inform your doctor and pharmacist of all medications you are taking. Key interactions include:
- Tetracyclines (contraindicated — additive risk of pseudotumor cerebri)
- Vitamin A supplements (additive toxicity — avoid high-dose vitamin A)
- Wax hair removal (avoid — skin is fragile)
New Zealand Prescribing Information
Isotretinoin (Roaccutane® 10 mg, 20 mg, 40 mg capsules; Oratane® capsules) is funded by Pharmac under Special Authority, prescribed through dermatologists or GPs with specialist support. A mandatory Pregnancy Prevention Programme applies to all women of childbearing potential: negative pregnancy test before prescribing, two forms of effective contraception during treatment and for 1 month after, and monthly pregnancy tests throughout. Male patients should also avoid donating blood or sharing medicine.
Frequently Asked Questions
How effective is isotretinoin for acne?
Isotretinoin is the most effective acne treatment available — approximately 85% of patients achieve long-term remission after one course. Many patients are essentially “cured” of acne after treatment, with relapse rates much lower than with other treatments.
Does isotretinoin cause depression?
There is ongoing debate about whether isotretinoin causes depression, as both severe acne itself and isotretinoin have been associated with depressive symptoms. Medsafe recommends monitoring mood throughout treatment and stopping if significant depression or suicidal ideation develops. Discuss any pre-existing mental health history with your prescriber before starting.
⚠️ Disclaimer: This page is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your doctor or a qualified health provider. In New Zealand, medication availability and funding may vary — check with Pharmac or your pharmacist for current information.
Reviewed by a Registered Pharmacist NZ
References & Further Information
The following New Zealand and international resources were used to inform this page: