It is highly important to observe that the official doses of the various pharmacopoeias may with safety be greatly exceeded in practice.
Oxycedrus, from the Mediterranean district and Madeira, yields cedar-oil which is official in most of the European pharmacopoeias, but not in that of Britain.
The study of pharmacological actions was at first almost entirely confined to those of remedial agents, and especially to the remedies in the different national pharmacopoeias, but in many cases it has now been extended to substances which are not used for curative purposes.
Cannabis indica - as the drug is termed in the pharmacopoeias - may be given as an extract (dose 4-1 gr.) or tincture (dose 5-15 minims) .