Why must IV infusion rate be carefully controlled?

Why must IV infusion rate be carefully controlled?

• A. To prevent high plasma concentrations that could cause toxicity
• B. To minimize distribution to tissues
• C. To maximize first-pass metabolism
• D. To ensure the drug is absorbed from the GI tract

Answer: (A)

Controlling the IV infusion rate is about keeping plasma drug levels within a safe, therapeutic range by preventing peaks that could cause toxicity. When a drug is given IV, it enters the bloodstream directly, so concentrations can rise quickly if the infusion is too rapid. A slower, steady rate helps avoid dangerous spikes while still achieving effective exposure over time. First-pass metabolism and GI absorption aren’t involved with IV administration, since the drug bypasses the gut, and distribution to tissues is influenced by factors like perfusion and binding, not the infusion rate alone.

Controlling the IV infusion rate is about keeping plasma drug levels within a safe, therapeutic range by preventing peaks that could cause toxicity. When a drug is given IV, it enters the bloodstream directly, so concentrations can rise quickly if the infusion is too rapid. A slower, steady rate helps avoid dangerous spikes while still achieving effective exposure over time. First-pass metabolism and GI absorption aren’t involved with IV administration, since the drug bypasses the gut, and distribution to tissues is influenced by factors like perfusion and binding, not the infusion rate alone.