Isotretinoin: pregnancy prevention, mood monitoring and laboratory checks

Why isotretinoin is so tightly controlled

Isotretinoin is a retinoid, related to vitamin A, that reduces sebaceous gland size, sebum secretion and keratinisation, although its exact mechanism is unknown. It is used for severe acne that has not responded to other treatment. High-dose vitamin A supplements share many of its side effects, so taking both together is discouraged.

The drug is contraindicated in pregnancy because any amount, even for a short time, can cause severe birth defects. In the United States, prescribers, pharmacies and every patient, including men and people who cannot become pregnant, must be registered with the iPLEDGE risk programme. Patients should not buy isotretinoin online or share capsules with anyone.

Pregnancy prevention in practice

Patients who can become pregnant must use two forms of contraception together for at least one month before starting, throughout treatment and for one month after stopping, unless they commit to continuous abstinence. They need a negative screening pregnancy test and monthly negative tests at a certified laboratory, and the prescription must be collected within seven days of the specimen.

The nurse's role is practical: confirm test timing, ask about contraception at every contact and note that progestin-only mini-pills may not work during treatment. Teach the patient to stop isotretinoin and call the prescriber at once if a period is missed, sex occurs without two forms of contraception or pregnancy is suspected. Use calm, nonjudgemental language so disclosure feels safe.

Mood changes and other symptoms to report

The label warns that isotretinoin may cause depression, psychosis and, rarely, suicidal thoughts, suicide attempts, suicide, and aggressive or violent behaviour. Ask about any psychiatric history before treatment, screen mood at each visit and teach the patient and family to report sadness, irritability, withdrawal or unusual thoughts. Thoughts of self-harm need urgent help.

Pseudotumor cerebri, a rise in pressure around the brain, can present with headache, nausea, vomiting and visual disturbance, and tetracycline antibiotics should be avoided because they add to this risk. Night vision can decrease suddenly, so caution with night driving is part of teaching. Dry skin, lips and eyes, muscle and joint pain, and sun sensitivity are common.

Laboratory monitoring and lifestyle teaching

Marked triglyceride elevations occurred in about a quarter of patients in clinical trials, with some showing falls in HDL cholesterol or rises in total cholesterol. These changes reversed after stopping. Lipid tests are checked as the prescriber orders, and limiting dietary fat and alcohol helped some patients bring triglycerides down. Report results the prescriber has flagged as concerning, and do not reassure patients that changes are harmless before review.

Mild to moderate liver enzyme rises occurred in some patients, and clinical hepatitis has been reported; the drug is stopped if enzymes fail to settle or hepatitis is suspected. NHS advice is to avoid alcohol because of liver risk. Further teaching: use sunscreen, avoid sunbeds, and avoid waxing, laser treatments and dermabrasion during treatment and for six months afterwards because of scarring risk.

Blood donation and a worked example

Patients must not donate blood while taking isotretinoin or for one month after treatment ends. This rule applies to everyone on the drug, not only to people who can become pregnant, so include it in every teaching session alongside the rule against sharing capsules with friends or family.

Consider a hypothetical 19-year-old in her third month of treatment who plans to give blood at a campus drive and mentions she has switched to a mini-pill alone. Options include praising the donation, advising a short delay, or explaining that donation must wait until a month after treatment and notifying the prescriber about the contraception change. The last option addresses both safety risks.

Sources and further reading

DailyMed: Isotretinoin capsules prescribing information. iPLEDGE requirements, two forms of contraception, pregnancy testing, psychiatric warnings, lipid and liver changes, pseudotumor cerebri with tetracyclines, night vision, vitamin A, mini-pills and blood donation.

MedlinePlus: Isotretinoin. iPLEDGE registration for all patients, stopping and calling if pregnancy is possible, blood donation, and avoiding waxing, laser and dermabrasion for six months.

NHS: Isotretinoin capsules. Contraception starting a month before treatment, mental health screening, regular blood tests, sun protection and avoiding alcohol.