Isotretinoin (Accutane)

Structure: 13-cis-retinoic acid, a stereoisomer of tretinoin and a vitamin A derivative. It shrinks sebaceous glands and reduces sebum output by up to 90%, normalises follicular keratinisation, and secondarily reduces Cutibacterium acnes colonisation and inflammation. It is the only acne therapy that reliably produces remission after the course ends.

Dosage:

• Standard: 0.5-1.0mg/kg/day, roughly 40-80mg/day for an 80kg male
• Cumulative target: 120-150mg/kg over the full course. This total, not the daily dose, is what predicts relapse. A course typically runs 5-8 months.
• Low-dose protocols: 10-20mg/day, or 20mg 2-3 times weekly, run longer. Far milder side effects, popular for steroid acne, with a higher relapse rate.
• Starting: begin at 20mg/day for 2-4 weeks regardless of target dose, to blunt the initial flare

Administration:

• Oral capsule taken with a fat-containing meal. Absorption roughly doubles with food; the lidose formulation is less food-dependent.
• Split doses above 40mg/day across two meals
• Do not take vitamin A supplements concurrently. Effects are additive and produce hypervitaminosis A.
• Avoid concurrent tetracyclines (doxycycline, minocycline): the combination raises the risk of idiopathic intracranial hypertension.
• Avoid waxing, laser, chemical peels, and elective dermatological procedures during the course and for around 6 months after, because skin fragility and delayed healing persist.

Key Notes:

• Lipids are the headline problem for enhanced athletes. Isotretinoin raises triglycerides in roughly 20-45% of users, raises LDL in a smaller share, and lowers HDL. AAS, particularly 17-alpha-alkylated orals and 19-nors, already suppress HDL severely and raise LDL. The two effects are additive, and the combined panel can be markedly worse than either alone. If you are running both, assume the hit and test on schedule rather than hoping.
• Triglycerides above roughly 5.6 mmol/L (500 mg/dL) is the threshold where pancreatitis risk becomes real. That is a stop-or-reduce point, not a wait-and-see point.
• Transaminase elevation occurs in about 10-15%, usually mild, dose-related, and reversible. Stacked with hepatotoxic orals, attributing a rising ALT to one drug or the other becomes guesswork, which is itself a reason not to run both at full dose.
• Teratogenicity is absolute. A single dose during pregnancy can cause severe craniofacial, cardiac, thymic, and central nervous system malformations. Pregnancy prevention programmes (iPLEDGE in the US and equivalents elsewhere) require two forms of contraception and monthly pregnancy testing from one month before the course through one month after. These requirements exist because the risk is not theoretical.
• Blood donation is prohibited during the course and for one month afterwards, for the same reason.
• Not hormonal and not suppressive. It does not lower testosterone or affect the HPTA. Steroid acne is driven by androgen-stimulated sebum production, and isotretinoin acts downstream on the sebaceous gland rather than on the hormones causing it. It treats the acne, not the cause.
• Musculoskeletal side effects hit lifters hardest. Joint pain, muscle aches, back pain, and elevated creatine kinase are common, and heavy training makes them worse. CK elevations of several times the upper limit are seen. Since lifters already run high CK from training, you need a rested baseline to interpret anything.
• Mucocutaneous dryness is close to universal: chapped lips, dry eyes, dry nasal passages, nosebleeds, contact lens intolerance. Manage with occlusive lip balm, preservative-free eye drops, and saline nasal spray.
• Mood changes and depression have been reported. The population-level causal link is still debated, but a personal or family history of depression justifies closer monitoring, especially during a cycle or PCT when mood is already unstable.
• Reduced night vision can develop and may persist. Relevant if you drive at night or train early.
• An initial flare in the first 4-6 weeks is common and is not treatment failure.

Bloodwork Monitoring:

• Baseline before starting: fasting lipid panel (Total Cholesterol, LDL, HDL, Triglycerides), plus ALT, AST, and GGT. Pregnancy test where applicable.
• Repeat lipids and liver enzymes at 4 weeks and 8 weeks. Once two consecutive panels are stable at the target dose, testing can be spaced out.
• Fast properly for the lipid draw. Triglycerides are the marker most distorted by a non-fasted sample, and here it is the one you care about most.
• On cycle, run the extended lipid panel: add Non-HDL Cholesterol, ApoB, and Lp(a) if available. HDL on isotretinoin plus orals can fall to single digits, and ApoB gives a truer picture of atherogenic burden than LDL alone.
• Stop or reduce dose if triglycerides exceed roughly 5.6 mmol/L (500 mg/dL), or if ALT or AST exceed three times the upper limit of normal.
• Creatine Kinase: get a baseline after 48-72 hours without training so you have a real comparator. Without that, training-induced CK and drug-induced CK are indistinguishable.
• Fasting Glucose: worth including if you are also running GH or MK-677, since isotretinoin can mildly worsen glycaemic control.
• A Vitamin D check is reasonable on a long course given the strict sun avoidance that comes with photosensitivity.