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PharmD clinical pharmacy program Level 3, Semester 2 Biopharmaceutics & Pharmacokinetics (PT608(

The Transcellular can divided to different mechanism which are:

1. Passive diffusion

➢ Most drugs are transported across the membranes by passive diffusion

 Diffuses across the membrane in the direction of drug’s concentration

gradient.

 Diffusion rate is directly proportional to the gradient.

 No need of energy

 No a carrier is involved

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