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Peak levels and half life of LSD. LSD has a plasma half-life of 2.5-4 hours. The onset of LSD effects is rapid following intravenous administration (10 minutes) and slower when taken orally (20-30 minutes). LSD effects usually peak at 2-4 hours and gradually diminishing over 6-8 hours. Residual effects may last longer but usually resolve within 12 hours of dosing.
How long does Adderall 20mg take to kick in? It seems to range from person to person, but from my experience, it usually takes about 30 minutes to an hour to feel the effects of adderall begin.