Lipinski's rule of 5 (Ro5) is applicable to the development of: Select all correct answers.

Question

BlackTom AI · Accepted Answer

Lipinski’s rule of 5 is a set of empirical thresholds that predict good oral bioavailability for small-molecule drugs: molecular weight ≤ 500 Da, octanol–water partition coefficient (logP) ≤ 5, ≤ 5 hydrogen-bond donors, and ≤ 10 hydrogen-bond acceptors.

1. Relevant knowledge points and concepts
- Lipinski’s Ro5 applies specifically to orally administered, small-molecule, systemically absorbed drug candidates. It is aimed at predicting intestinal permeability and oral bioavailability.
- Ro5 does not apply to large biologicals (proteins, peptides), drugs delivered parenterally (injections), topical-only therapies, or molecules that rely on active transport or prodrug strategies.

2. Step-by-step reasoning
- Identify the route/formulation in each option: (a) injection (parenteral), (b) tablet (oral solid), (c) topical ointment (local transdermal/topical), (d) capsule (oral solid).
- Ro5 is relevant only when oral systemic absorption is the development goal. Tablets and capsules are oral dosage forms intended for systemic absorption.
- Therefore options b and d fall into the category Ro5 is designed to guide.

3. Calculations / intermediate steps
- No numerical calculations are required here. If evaluating a specific molecule, one would check its MW, logP, H-bond donors and acceptors against the four thresholds. For this question the logic is categorical (route/formulation), so no arithmetic steps are needed.

4. Why the correct answers are correct
- Anti-cancer drugs delivered as a tablet (b) and seasickness drugs delivered as a capsule (d) are oral small-molecule therapies for which intestinal permeability and oral bioavailability are key—exactly what Ro5 assesses. Thus Ro5 is applicable during their development.

5. Why the other options are incorrect
- (a) Anti-inflammatory biological agents delivered as an injection: biologicals (large proteins/antibodies) and parenteral delivery bypass intestinal absorption; Ro5 is not applicable.
- (c) Steroidal drugs delivered as a topical ointment: topical delivery is intended for local effect or transdermal absorption, not oral absorption—Ro5 is focused on oral bioavailability and so is not the primary guideline for topical formulations.

6. Conclusion
- Based on the route-of-administration criterion inherent in Lipinski’s rule of 5, the correct selections are b. Anti-cancer drugs delivered as a tablet and d. Seasickness drugs delivered as a capsule, matching the provided answer.

Lipinski's rule of 5 (Ro5) is applicable to the development of: Select all correct answers.多项选择题

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