Psilocybe cubensis is a medium strength psilocybian mushroom consisting of approximately .63% psilocybin and .60% psilocin in dried wild mushrooms. Indoor cultivated mushrooms tend to have higher concentrations. Note that potency of mushrooms can vary greatly from one batch to the next. The following chart shows approximate oral dosages for (dried) Psilocybe cubensis in grams.

Oral P. cubensis Dosages Threshold .25 g 1/100 oz Light .25 - 1 g 1/100 - 1/28oz Common 1 - 2.5 g 1/28 - 1/10oz Strong 2.5 - 5 g 1/10 - 1/6oz Heavy 5 + g 1/6oz +

Onset : 10 - 40 minutes (when chewed and held in mouth) Onset : 20 - 60 minutes (when swallowed on empty stomach) Duration : 2 - 6 hours Normal After Effects : up to 8 hours

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Comparative potency of selected Psilocybe mushrooms, Stamets 1996

Extraction and analysis of indole derivatives from fungal biomass, Gartz 1994

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Psychedelics Encyclopedia, by Peter Stafford
Psilocybin Mushrooms of the World, Paul Stamets