What should be the log P value for an ideal drug candidate for transdermal permeation:
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- Below 1
- 1-3
- 5-7
- Above 7
The Correct Option is B
Solution and Explanation
Step 1: Understanding log P value. The log P value is a measure of a drug's lipophilicity, representing its distribution between a lipid (oil) phase and an aqueous phase. It determines how easily a drug can permeate lipid membranes, such as the skin.
Step 2: Log P value range for transdermal permeation. For transdermal delivery, the drug must have balanced hydrophilic and lipophilic properties: - A log P value of 1-3 is ideal, ensuring sufficient lipid solubility for permeating the skin's lipid barrier while maintaining water solubility for systemic absorption.
Step 3: Why other options are incorrect.
- (A) Below 1: Too hydrophilic, making it difficult to cross the lipid-rich stratum corneum.
- (C) 5-7: Too lipophilic, leading to accumulation in the skin and poor systemic absorption.
- (D) Above 7: Extremely lipophilic, making it almost impossible to achieve systemic delivery.
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