A 24-year-old female is prescribed erythromycin for gastroparesis. It is prescribed four times daily due to its short half-life. What is the rationale for such a frequent dosing?

A 24-year-old female is prescribed erythromycin for gastroparesis. It is prescribed four times daily due to its short half-life. What is the rationale for such a frequent dosing?

A 33-year-old woman was hospitalized after 1 week of increasing pain, tenderness, and cyanosis in her legs. She admitted to taking several medications to relieve a migraine headache. Physical examination revealed that no pulses could be palpated below the femoral vessels, and an aortogram showed a pronounced constriction of the vessels distal to the iliac arteries. The vasoconstriction disappeared after 3 hours of nitroprusside intravenous infusion. Which of the following drugs most likely caused the vessel constriction?

A29-year-old woman suffering from allergic rhinitis started treatment with loratadine. The drug can completely counteract the histamine-induced release of which of the following endogenous compounds?

A 21-year-old woman suffering from seasonal allergic conjunctivitis started a treatment with eye drops of azelastine, a second-generation histamine H1 antagonist. Second-generation H1 antagonists are used locally in the conjunctiva instead of first-generation H1 antagonists to provide which of the following therapeutic advantages?

What is implied by 'active transport'?