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Applying drugs to brain via scalp (transdermal)

Many medications are intended only for the brain, but are taken orally. Hence <10% finds its intended target, while the remaining >90% is at best wasted, and at worst causes unwanted side-effects. ...
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What Conditions must Drugs satisfy for them to be Deliverable via the Transdermal route?

What Conditions must Drugs satisfy for them to be Deliverable via the Transdermal route? I assume a high $\log{P}$ (lipophilicity) would be one, are there any others?