This section is from the book "Laboratory Manual Of Pharmacology", by A. D. Bush. Also available from Amazon: Laboratory manual of pharmacology.
Plasters are solid, adhesive preparations, spread on some fabric, and usually requiring warming before being applied to the body.
Prepare as follows a satisfactory substitute for the official Emplastrum Sinapis: To 8 Gm. flour add 4 Gm. mustard; mix thoroughly, then add just enough warm water (not hot) to make a soft smooth paste. Spread this on heavy paper or on cottoncloth.
Bind some of your prepared Mustard Plaster on the flexor surface of your forearm, and leave it there until distinctly sharp sensations are perceived. Remove plaster, and examine appearance of the skin. Report:....................................................................................................................
Time taken for effect:.......................................................................................................................................................
Nature of effect:...................................................................................................................................................................................
Duration of effect:.......................................................................................................................................................................................
The following Plasters are official:
Sample | Strength | Utility |
Emplastrum Belladonna | 0,35% | Local sedative (any effect doubtful) |
Emplastrum Cantharidis | 0.1% | Vesicant; very seldom indicated |
Emplastrum Capsici | Rubefacient and vesicant | |
Emplastrum Elasticum | Surgeons' adhesive plaster | |
Emplastrum Plumbi | Base for resin plaster | |
Emplastrum Resinae | Cutaneous macerant | |
Emplastrum Sinapis | Counterirritant |
 
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