Absorption of ocular timolol.
The absorption of timolol after topical administration to the eye was studied in 11 healthy volunteers and in 5 patients with bilateral open angle glaucoma. The volunteers received 2 drops of 0.5% timolol ophthalmic solution in each eye, equivalent to 0.8 mg of timolol maleate. Overflow was absorbed by paper tissue. The patients received the same dose twice daily for 2 weeks and were then investigated. In the paper tissue, 12 to 88% of the dose administered was recovered. Plasma concentrations were never above 5 ng/ml and not always detectable (detection limit 1 to 2 ng/ml). However, timolol was absorbed as the drug was found in the urine samples from all volunteers and glaucomatous patients.
D000042:Absorption; D000328:Adult; D005123:Eye / Q000378:metabolism*; D005260:Female; D005901:Glaucoma / Q000188:drug therapy; D006801:Humans; D007700:Kinetics; D008297:Male; D009883:Ophthalmic Solutions; D011412:Propanolamines / Q000378:metabolism*; D013997:Time Factors; D013999:Timolol / Q000008:administration & dosage / Q000097:blood / Q000378:metabolism* / Q000627:therapeutic use
D009883:Ophthalmic Solutions; D011412:Propanolamines; D013999:Timolol