Forehead lift or Botox after ptosis surgery?

Hello and thank you for your question. A forehead lift and Botox often follow a surgery to correct ptosis (drooping) of the eyelids. After an eyelid surgery, patients may experience increased dissatisfaction with the appearance of their forehead area or may simply want to extend their fresh, new look. You will want to consider these factors first before proceeding, however.
You will want to allow sufficient time to heal from your eyelid procedure before receiving a Botox injection. This minimizes the risks — which are small — of Botox relapsing your ptosis. Similarly, you will want to assess the final results of your ptosis surgery before determining how much forehead augmentation you will need.
A board-certified facial plastic surgeon can provide you with an aesthetic recommendation and a comprehensive surgical plan during an in-person evaluation. Good luck!- Elbert T. Cheng, MD

I agree with others.  It would be fine to perform either neurotoxin injections or forehead surgery after ptosis surgery.
Check with your ptosis surgeon, but in general I recommend at least 6 weeks before undergoing Botox injections; especially in the glabellar area.  Surgery in the eyelids can create potential spaces where the Botox can spread where it shouldn't.  Would wait 2-3 months before forehead surgery.