Half-life profile

LSD half-life calculator

Estimate how much LSD remains in your body over time using a first-order elimination model. Values are approximate and should not replace lab testing or medical advice.

Dose taken

Time since dose (hours)

Now estimated in body: 0.86 mg(0.9% of starting amount)Half-life used: 3.5 h

Pharmacokinetics at a glance

Mean half-life	3.5 hours

Typical detection windows

Detection windows are approximate and depend on dose, frequency, metabolism, specimen cutoffs and lab methods.

Matrix	Window
blood	Detectable for several hours after ingestion; specialized assays may detect low levels up to ~1 day.
urine	Parent drug and metabolites often detectable for 1–4 days with sensitive methods.
hair	May be detectable for months in frequent or high-dose users, depending on hair length.

How this model treats LSD

The calculator uses a simple one-compartment model with first-order elimination. Every half-life, the remaining amount is halved. Real-world pharmacokinetics can be more complex (multi-compartment models, active metabolites, saturable metabolism).

Medically reviewed sources

Passie T et al. The pharmacology of lysergic acid diethylamide: a review (2008).

Notes

This page is for educational and informational purposes only. It does not provide medical or legal advice and does not tell you whether you are safe to drive, work or pass a drug test.