Can i use one vial of restasis twice a day?

Short answer: No. Restasis vials are single-use. Each dose (one drop in each eye) is taken from a new vial, and the vial should be discarded after use.

Since Restasis is usually prescribed as one drop in each eye twice daily (about 12 hours apart), you would typically use two vials per day (one for the morning dose and one for the evening dose). If your doctor gave you different instructions, follow those and check with your pharmacist or prescriber if you’re unsure.