Question 53

Tablets designated ER or XR deliver doses slowly over a given time period.

Extended-release (ER) or extended-release (XR) tablets are formulated to release the active ingredient gradually over a specified duration, allowing for sustained therapeutic effects and reducing the frequency of dosing.

A) deliver doses slowly over a given time period

This option is correct because ER (extended-release) and XR (extended-release) tablets are specifically designed to release their active ingredients slowly over time. This mechanism helps maintain steady drug levels in the bloodstream, improving the medication's effectiveness and patient adherence.

B) release doses instantly for immediate action

This option is incorrect as it describes immediate-release formulations rather than ER or XR tablets. Immediate-release tablets are designed to dissolve quickly in the body, providing rapid onset of action, which is the opposite of what ER and XR formulations achieve.

C) are substitutable with other dosage forms of the same generic

This option is not accurate because while some medications may have interchangeable forms, ER and XR tablets are not generally considered substitutable with immediate-release versions due to differences in their release mechanisms and dosing schedules. Substitution could lead to therapeutic failures or side effects.

D) may be crushed or chewed

This option is incorrect, as ER and XR tablets should not be crushed or chewed. Doing so would disrupt the controlled-release mechanism, potentially leading to rapid release of the drug and an increased risk of side effects or toxicity.

Conclusion

The correct answer, A, clearly defines the purpose of ER and XR tablets, emphasizing their role in sustained drug delivery over time. In contrast, options B, C, and D highlight misunderstandings about the nature of these formulations, as they either misrepresent their release characteristics or disregard safety protocols related to their administration.