It is prepared in the same manner as extract of aconite.

Succus Spissatus Lactucae Sativae. Edin. Inspissated Juice of Garden Lettuce

Syn, Extrait de Laitue (F.).

This is to be prepared from the fresh leaves, according to the general directions for preparing inspissated juices.

Succus Spissatus Lactucae Virosae. Inspissated Juice of the Wild Lettuce

Syn. Extrait de Laitue vireuse (F.), Estratto dell' erba della Lactuca (I.).

To be prepared from the fresh herb, in the same manner as the other inspissated juices.

One cwt. of lettuce yields between four and five lbs. of the extract.2

The extracts of both the above species of lactuca are exhibited as substitutes for opium, in cases in which the intention is rather to allay irritation than to produce the full effect of a narcotic. The dose is from grs. iij. to grs. vj., and more, gradually increased.1

1 Brandes Manual, p. 400.

2 Ibid.