Potential Risk of LSD
"Bad Trips" Severe panic reactions ("bummers" or "bad trips") and other adverse effects sometimes occur with LSD. Users report having hundreeds of pleasurable good trips, then for no apparent reason having a "bummer", complete with monstrous perceptions and delusions of being trapped forever in the drugged state. Such "bummers" are common with high doses and impure drugs. They sometimes occur accidentally because the purity of black market LSD varies widely and because it takes much skill to measure the extremely small amounts needed for an acid trip.