Drug doses are measured primarily using two methods: by weight and by volume. These measurements are essential for accurate administration and patient safety.
Weight-Based Measurement
Weight measurements are used for solid medications and often for active ingredients within solutions.
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Units:
- Grams (g)
- Milligrams (mg)
- Micrograms (mcg or µg)
These units are used to measure the mass of the drug. For example, a tablet might contain 500 mg of acetaminophen. The reference states: "Drugs are generally measured according to...The weight of a drug (grams, milligrams and micrograms, for example)".
Volume-Based Measurement
Volume measurements are used for liquid medications and solutions.
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Units:
- Millilitres (mL)
- Litres (L)
These units are used to measure the amount of liquid. For instance, a cough syrup might have a recommended dose of 5 mL. As stated in the reference: "Drugs are generally measured according to... The volume (millilitres and litres)".
Summary Table
| Measurement Type | Units | Example |
|---|---|---|
| Weight | Grams (g), Milligrams (mg), Micrograms (mcg/µg) | A 500 mg tablet of paracetamol |
| Volume | Millilitres (mL), Litres (L) | A 5 mL dose of cough syrup |
These two methods ensure that patients receive the correct amount of medication. Accurate measurement, whether by weight or volume, is vital for effective treatment and patient safety.
