Hi Botox sux. That name made me laugh. Check with your injector about the prescription. We suggest Iopidine. Not sure how the over the counter as we have had only two cases of ptosis in the last 8 years so do not have to prescribe it a lot.
You would need a prescription for Iodipine drops to the eye but you would want this problem assessed first to determine which anatomic structure has been affected. The good news is that this effect can typically wear off rather quickly after 3 weeks. Consult with your plastic surgeon to determine which is necessary. At the next treatment with Botox, the dosing may need adjustment and you definitely want to make sure this is done by experienced hands and not passed off to an assistant or technician.