1 drop in each eye BID, approximately 12 hours apart, for 6 weeks
Collarette cure in about half of patients by week 6, with most clearing to 10 or fewer collarettes.
Contraindications
None.
Available Forms
0.25% (2.5 mg/mL) solution, 10 mL multiple-dose dropper bottle, 1.5 mL dropper bottle
Mechanism of Action
Ectoparasiticide that inhibits GABA-gated chloride channels selective for mites, producing paralysis and death of Demodex. Not an inhibitor of mammalian GABA-mediated chloride channels when tested in vitro up to 30 micromolar, roughly 1100 times the recommended human ophthalmic dose.
Warnings & Precautions
Contamination risk: Tip contact with the eye, surrounding structures, fingers, or any surface can contaminate the solution, and contaminated solutions can cause serious eye damage and loss of vision.
Contact lens wear: Remove lenses before instillation and reinsert 15 minutes afterward; the potassium sorbate preservative may discolor soft lenses.
Common Side Effects
Ocular, most common: Instillation-site stinging and burning 10% (833 patients treated for 42 days in Saturn-1 and Saturn-2).
Ocular, under 2%: Chalazion or hordeolum, punctate keratitis.
Tolerability, Saturn-2: 90.7% of patients rated the drop neutral to very comfortable, with mean compliance 98.7%.
Pregnancy & Lactation
Pregnancy: No human data; systemic exposure after ocular dosing is low and animal reproduction studies produced no malformations at clinically relevant doses. Oral dosing in rats increased post-implantation loss and reduced fetal weight with incomplete ossification only at 1390 times the recommended human ophthalmic dose on a body surface area basis and in the presence of maternal toxicity, with one fetus at that dose showing situs inversus that could not be excluded as treatment related; rabbits showed no embryofetal toxicity or teratogenic findings at 580 times the human dose on an AUC basis.
Lactation: No data on presence in human milk, effects on the breastfed infant, or milk production; systemic exposure after 6 weeks of topical dosing is low and the drug is more than 99% plasma protein bound.
Pediatric Use
Safety and effectiveness not established below age 18.