Understanding Veterinary Drug Concentrations
What mg/mL, mcg/mL, percent solutions and IU mean in veterinary products, and how to convert between them.
Veterinary drug labels express concentration in several different ways. The most common is mg/mL, which means milligrams of drug per milliliter of solution. Concentrations can also be expressed as mcg/mL, g/mL, percent (%), or in International Units (IU) for certain biological products.
mg/mL is the most direct form for dose calculation because it matches the mg dosage unit without conversion.
mcg/mL is used for very dilute products. One mcg is one thousandth of a milligram, so 1000 mcg/mL equals 1 mg/mL.
Percent solutions express grams per 100 mL. A 1% solution contains 1 g per 100 mL, which is the same as 10 mg/mL.
IU is used for products like insulin and some vitamins where the biological activity, not the mass, is the meaningful unit. IU cannot be converted to mg without product-specific information.
When you calculate a volume, always check that the concentration unit on the label matches the concentration unit you entered in the calculator.
Educational use only
Educational calculation only. This result does not determine whether the medication or dose is appropriate for an individual animal. Verify clinical decisions with a qualified veterinarian.