- 40)1536(38⅖ m. to 1 pint of solution (water).
- 120
- 336
- 320
- ¹⁶/₄₀ = ⅖.
To get a ¹/₁₀₀ of a grain dose of any drug out of a solution of 60 minims containing ¹/₃₂ of a grain of that drug, compute as follows:
- ³²/₃₂ or 1 grain = 32 × 60, or 1920 m.
- ¹/₁₀₀ = ¹/₁₀₀ of 1920 m.
- 100)1920(19⅕ m.
- 100
- 920
- 900
- 20, or ⅕ m.
Rule.—Multiply the quantity of the solution on hand in minims by a number indicating the fractional amount of the drug therein contained, and divide by a number indicating the fractional amount of the drug desired.
| In | 20 parts of | solution | we have | 1 part of | carbolic acid. |
| In | 1 part | “ | “ | ¹/₂₀ “ | “ |
| In | 100 parts | “ | “ | 100 × ¹/₂₀ = 5 pt. | “ |
| 40 parts contain | 1 part of | carbolic acid. |
| 1 part contains | ¹/₄₀ “ | “ |
| So that ¹/₄₀ solution is a 2½ per cent. carbolic acid solution. | ||
ACTION, USES, AND DOSES OF
THE MOST IMPORTANT DRUGS.
Acetanilid.—This substance, a derivative of anilin, is used to lower temperature; to relieve headaches and neuralgic pains; and to allay spasm, as in chorea and whooping-cough.
Toxic doses cause lividity, cold sweats, ringing in the ears, and heart failure.
The dose is from 5 to 10 grains (0.3-0.6 gm.).