Pharmacokinetics of topical clonidine

Ramanjit Sihota*, Anuradha Ganesh, Gurupad Bandopadhyaya, Narendra Nath Sood, Suresh Kumar Gupta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The ocular penetration and systemic bioavailability following topical instillation between 0.125% and 0.06% clonidine were studied in rabbit eyes. The clonidine was bound to Tc 99m and assayed with a sensitivity of 0.006 mg/100 ul. In aqueous peak levels of clonidine were measured one hour after instillation, being 0.064 ug/100 ul with 0.125% clonidine and 0.061 ug/100ul with 0.06% clonidine. In the blood half an hour after administration 0.009 ug/100 ul of clonidine was present using 0.125% clonidine and 0.008 ug/100ul with 0.06% clonidine. Both concentrations of clonidine achieve similar aqueous and serum levels, suggesting an almost equal effect on intraocular pressure, with a small and transient effect on blood pressure.

Original languageEnglish
Pages (from-to)4-8
Number of pages5
JournalAnnals of Ophthalmology
Issue number1
Publication statusPublished - Jan 1995
Externally publishedYes

ASJC Scopus subject areas

  • Ophthalmology


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