The dried root of Aconitum Napellus, collected in winter or early spring before the leaves have appeared. From Britain or Germany.

U.S.P. Aconitum. The tuberous root of Aconitum Napellus.

Characters. - Conical and tapering, usually from one to three inches long, not thicker than the finger at the crown, blackish-brown, internally whitish. A minute portion, cautiously chewed, causes prolonged tingling and numbness.

Properties and Composition. - The chief active principle in both leaves and roots is an alkaloid aconitine or aconitia, which is combined with aconitic acid. It is only present in small quantity in the leaves. In the root resinous and fatty matters and several other active principles are also present. Ne-paul aconite, or Bikh, the root of A. ferox, contains an alkaloid, pseudaconitine, which is much more active than aconitine. Japanese aconite is said to contain an alkaloid which is much more powerful even than pseudaconitine. It is therefore very important that officinal preparations should be made only from the root of A. Napellus.

B P Aconiti Radix Aconite Root 275

Fig. 176.

Aconite, half the natural size.

Officinal Preparations

B.P.

Dose.

Tinctura Aconiti...............................................................

1-15 minims.

Linimentum Aconiti (p. 516)..........................................

U.S.P.

Abstractum Aconiti...........................................................

1/2-1 gr. (.03-.36 gm.)

Extractum Aconiti............................................................

1/6-1/3 gr. (.01-.02 gm.)

Extractum Aconiti fluidum................................................

1/2-2 min. (.03-.12 c.c.)