The US Food and Drug Administration (FDA) has approved an intracameral implant with 75 mcg of travoprost to reduce intraocular pressure (IOP) in patients with open-angle glaucoma (OAG) or ocular hypertension (OHT).
The iDose TR (Glaukos Corp) is inserted into a corneal incision on the temple side of the eye. Pivotal phase 3 clinical trials showed the treatment resulted in sustained reductions in IOP for three months ranging from 6.6 to 8.4 mm Hg, comparable to reductions with topical timolol.5% drops used twice daily. Normal IOP is 10-21 mm Hg, and glaucoma treatments are designed to reduce high IOP into the normal range.
Glaukos Corp said that it intends a commercial launch of the implant early in 2024, with a wholesale cost of $13,950 per implant.
Travoprost is a prostaglandin analog that has been long used as a topical formulation for lowering IOP in OAG and OHT. Timolol is a topical beta-blocker widely used for the same indications.
iDose TR comes in a preloaded handheld injector designed to deliver the implant into the sclera of the eye. The implant seats in the junction of the iris, sclera, and cornea.
In two phase 3 clinical trials, 81% of patients who received the iDose TR did not require supplemental drops to reduce IOP after 12 months compared with 95% of those who receive timolol alone.
The phase 3 trials included 1150 participants across 89 clinical sites. Both trials, GC-010 and GC-012, met the primary endpoints through 3 months and demonstrated a favorable tolerability and safety profile through 12 months, according to results that John Berdahl, MD, a researcher with Vance Thompson Vision in Sioux Falls, South Dakota, and an investigator for Glaukos, presented in May at the American Society of Cataract and Refractive Surgery.
Based on these outcomes, the FDA concluded in the prescribing information that iDose TR demonstrated noninferiority to topical timolol in reduction of IOP during the first 3 months of treatment. The agency also noted that use of iDose TR did not demonstrate noninferiority over the next 9 months.
In the controlled studies, the most common ocular adverse reactions reported in 2% to 6% of patients who received iDose TR were increases in IOP , iritis, dry eye, and defects of the visual field, most of which were said to be mild and transient in nature.
Richard Mark Kirkner is a medical journalist based in the Philadelphia area.
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