In oleaginous bases, which type of drug has better release?

In oleaginous bases, which type of drug has better release?

• A. Water-soluble
• B. Lipid-soluble
• C. Neutral
• D. Amphiphilic

Answer: (A)

Release from oil-based (oleaginous) bases is governed by how the drug distributes between the base and the skin. If a drug is highly soluble in the oil base, it tends to stay within the base and diffuse into the skin slowly, giving slower release. Water-soluble drugs are not soluble in the oil; when dispersed in an oil base, they are more likely to dissolve into the thin aqueous layer at the skin surface and then diffuse away, driven by the concentration gradient. This results in better release from oleaginous bases for water-soluble drugs compared with lipid-soluble ones, which remain more strongly sequestered in the oil. Amphiphilic or neutral drugs don’t have the same favorable partition into the aqueous skin environment as water-soluble drugs in this context, so their release is typically not as enhanced as for water-soluble drugs.

Release from oil-based (oleaginous) bases is governed by how the drug distributes between the base and the skin. If a drug is highly soluble in the oil base, it tends to stay within the base and diffuse into the skin slowly, giving slower release. Water-soluble drugs are not soluble in the oil; when dispersed in an oil base, they are more likely to dissolve into the thin aqueous layer at the skin surface and then diffuse away, driven by the concentration gradient. This results in better release from oleaginous bases for water-soluble drugs compared with lipid-soluble ones, which remain more strongly sequestered in the oil. Amphiphilic or neutral drugs don’t have the same favorable partition into the aqueous skin environment as water-soluble drugs in this context, so their release is typically not as enhanced as for water-soluble drugs.