After buccal/sublingual absorption, the drug first enters which circulation path?

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Study for the Pharmaceutics Xenobiotics Across Bio Membrane Test. Prepare with flashcards and multiple-choice questions, each providing hints and explanations. Get ready for your pharmacy exam!

Multiple Choice

After buccal/sublingual absorption, the drug first enters which circulation path?

Explanation:
The key idea is that sublingual and buccal absorption delivers the drug straight into the systemic venous system. The veins beneath the tongue drain into the facial veins and then into the internal jugular vein, leading to the superior vena cava and the right heart, so the drug enters systemic circulation first. This bypasses the hepatic portal vein, avoiding first-pass metabolism in the liver. If the drug is swallowed unintentionally, it would then enter portal circulation and be subject to hepatic first-pass effects, but the primary route for sublingual/buccal administration is systemic circulation.

The key idea is that sublingual and buccal absorption delivers the drug straight into the systemic venous system. The veins beneath the tongue drain into the facial veins and then into the internal jugular vein, leading to the superior vena cava and the right heart, so the drug enters systemic circulation first. This bypasses the hepatic portal vein, avoiding first-pass metabolism in the liver. If the drug is swallowed unintentionally, it would then enter portal circulation and be subject to hepatic first-pass effects, but the primary route for sublingual/buccal administration is systemic circulation.

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