Abstract
The effects of several hallucinogenic compounds and their nonhallucinogenic analogs were evaluated in an underwater swim alley. Rats were submerged and forced to swim underwater through plastic tubes 3.47 m long in order to escape at the other end of the tubes. All of the compounds tested significantly increased the starting latency but only d-amphetamine significantly increased swimming time. The peak effect time for d-lysergic acid diethylamide (LSD-25) and three amphetamine derivatives on latency was 20 mm after the i.p. injection; that for 2-brom-lysergic acid diethylamide (BOL-148) was 40 min. Dose-response curves indicated that the increase in latency was a function of dose. The ED50's for LSD-25, BOL-148, 2,4,5-trimethoxy-amphetamine (TMA-2) hydrochloride, 3,4,5-trimethoxyamphetamine (TMA) hydrochloride, d-amphetamine hydrochloride and 4,5,6-trimethoxyamphetamine (TMA-3) hydrochloride were 1.9, 11.0, 15.0, 31.0, 36.5 and 77.0 µmol/kg, respectively. An analysis of relative effectiveness indicated that LSD-25, TMA-2 and TMA (in descending order) were significantly more effective than their respective nonhallucinogenic analogs.
Footnotes
- Received August 1, 1966.
- Accepted September 15, 1967.
- © 1968 by The Williams & Wilkins Company
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