The term "site of action" refers to the specific location within the body where a drug exerts its therapeutic effect. It can vary depending on the dosage form of the drug. For example, if a drug is administered orally in the form of a tablet, the site of action may be the gastrointestinal tract where the drug is absorbed into the bloodstream. If a drug is administered topically in the form of a cream, the site of action may be the skin where the drug is applied. The dosage form determines how and where the drug is delivered in the body, ultimately determining its site of action.