Convert Micrograms to Apothecary Drams
Convert Micrograms (µg) to Apothecary Drams (dr ap) instantly and accurately.
Conversion Formula
dr ap = µg × 2.572059725e-7
About Micrograms
A microgram (µg or mcg) is one millionth of a gram (10⁻⁶ g). It is the standard dosing unit for potent medications and micronutrients: vitamin B12 recommended daily intake is 2.4 µg, folic acid supplements are 400 µg, and levothyroxine (thyroid medication) doses are typically 25-200 µg. Air quality standards measure fine particulate matter (PM2.5) in micrograms per cubic meter - the WHO guideline is 15 µg/m³ annual mean. A grain of sand weighs about 50-100 micrograms, and a single snowflake approximately 3 micrograms.
About Apothecary Drams
An apothecary dram (dr ap) equals 3 scruples or 60 grains - approximately 3.888 grams. Part of the traditional apothecary system used by physicians and pharmacists from the Middle Ages through the 19th century, it was the standard unit for prescribing and dispensing medicines. Prescriptions written in the apothecary system used special symbols: the dram symbol (℈) and ounce symbol (℥) appear throughout historical medical records and old pharmacy ledgers. The apothecary dram differs from the fluid dram (a volume unit) and from the avoirdupois dram.
Quick Reference Table
| Micrograms (µg) | Apothecary Drams (dr ap) |
|---|---|
| 1 µg | 2.572 × 10-7 dr ap |
| 2 µg | 5.144 × 10-7 dr ap |
| 5 µg | 1.286 × 10-6 dr ap |
| 10 µg | 2.572 × 10-6 dr ap |
| 25 µg | 6.43 × 10-6 dr ap |
| 50 µg | 1.286 × 10-5 dr ap |
| 100 µg | 2.572 × 10-5 dr ap |