Which statement about hydroxyzine GI absorption is true?

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Multiple Choice

Which statement about hydroxyzine GI absorption is true?

When a drug is taken by mouth, how well it is absorbed depends a lot on its chemical form. Hydroxyzine comes as different salts, notably the hydrochloride form (Atarax) and the pamoate form. The hydrochloride salt is highly water-soluble, so it dissolves quickly in gastric fluids and is absorbed efficiently through the GI tract. The pamoate salt, on the other hand, forms a larger, less soluble complex that dissolves more slowly, leading to slower and reduced GI absorption. Because of this, Atarax (the hydrochloride form) has better GI absorption than the pamoate form. In practice, hydroxyzine is used as an antiemetic among other indications, and its disposition is influenced more by hepatic metabolism to cetirizine than by renal elimination. Dosing limits can vary by indication and patient, so a single fixed maximum isn’t universally applicable.

When a drug is taken by mouth, how well it is absorbed depends a lot on its chemical form. Hydroxyzine comes as different salts, notably the hydrochloride form (Atarax) and the pamoate form. The hydrochloride salt is highly water-soluble, so it dissolves quickly in gastric fluids and is absorbed efficiently through the GI tract. The pamoate salt, on the other hand, forms a larger, less soluble complex that dissolves more slowly, leading to slower and reduced GI absorption. Because of this, Atarax (the hydrochloride form) has better GI absorption than the pamoate form.

In practice, hydroxyzine is used as an antiemetic among other indications, and its disposition is influenced more by hepatic metabolism to cetirizine than by renal elimination. Dosing limits can vary by indication and patient, so a single fixed maximum isn’t universally applicable.

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