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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.
Posts: 293. Re: how long will it take for my beta blocker to work. Beta blockers have somewhat an immediate effect but full effects take about two weeks to get to a calming effect and less dizziness. And I'm sure your doctor covered this with you...do NOT stop taking them suddenly under any circumstances.