What term describes the amount of active ingredient in a drug?

The term "strength" specifically refers to the amount of the active ingredient in a drug and is a critical aspect when it comes to understanding medications. It indicates how much of the active substance is present in a given quantity of the drug, often measured in grams, milligrams, or other units. Knowing the strength helps veterinarians and other healthcare professionals administer the appropriate amount of medication, ensuring efficacy and safety for the patient.

Dosage, while related, refers to the specific amount of a drug prescribed for an individual animal, which may take into account the strength but also factors such as the animal's weight and health condition. Concentration relates to the amount of active ingredient per volume of solution but does not specifically identify the total amount of active ingredient in a given dosage. Volume simply measures the space that a liquid occupies and does not denote the amount of active ingredient present in a medication. Thus, strength is the most accurate term for the context of the question concerning the amount of the active ingredient in a drug.