Interpretation and prediction of the kinetics of transdermal drug delivery: oestradiol, hyoscine and timolol

Richard H. Guy, Jonathan Hadgraft

Research output: Contribution to journalArticlepeer-review


A kinetic model has been used to predict the plasma concentration vs time profiles for oestradiol, hyoscine and timolol following transdermal drug delivery. Rate constants describing a drug's passage across the stratum corneum and viable epidermis are calculated from simple physicochemical parameters. When used in conjunction with the in vitro release characteristics of the topical formulation (simple vehicle or sophisticated delivery system), and with knowledge of the drug's systemic clearance, the kinetic values permit simulation of the expected plasma level profile. The theoretical predictions are consistent with published human in vivo data for each of the three compounds. This kinetic approach may be useful, therefore, in the evaluation of feasible candidates for transdermal drug delivery.

Original languageEnglish
Pages (from-to)159-163
Number of pages5
JournalInternational Journal of Pharmaceutics
Issue number2-3
Publication statusPublished - 31 Oct 1986

Bibliographical note

Funding Information:
Financial support was received from NIH (GM-33395) and Vick International. R.H.G. is the recipient of a Special Emphasis Research Career Award from the National Institute of Occupational Safety and Health (KOl-OH-00017).


  • transdermal drug delivery - oestradiol - hyoscine - timolol

ASJC Scopus subject areas

  • Pharmaceutical Science


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