I received botox 5 months ago and as a result have a drooping eyelid. When will it get better? (Photo)

Botox doesnt last 5 months, if you have a drooping eyelid I suggest you have that looked at as there may be something else going on.

Yes, botox can cause ptosis, but I dont think the injection of botox is related to what you are calling ptosis.  There is only the slightest, less than 0.5mm of ptosis on your lid.  You have an asymmetric lid platform that gives the impression that one eye is smaller than the other.  You would likely benefit from a conservative blepharoplasty in order to fix what I think you are referring to... Good luck.

The effects of Botox usually last between 3-4 months. By 5 months all of the Botox should be gone and your eyelid droop should be back to normal. Check your before pictures to see if this droop was present prior to your treatment.

The ptosis appears very mild and I am not convinced it is related to the Botox as the effect of Botox should have worn off by now. See an oculoplastic specialist.

It is highly unlikely that an eyelid ptosis would exist 5 months after Botox injection.  On average, the paralytic effect of botulinum toxin lasts 3-4 months.  It can last shorter or longer over time, but even when eyelid ptosis occurs, it typically resolves much faster - 4-6 weeks.  Based on your photos, I see less of of the lid on right owing more to BROW ptosis and not true lid ptosis.  This asymmetry may have been present but not recognized before your injections.  But injections may have also unmasked an underlying medical issue as well.  This is unlikely but I have seen a similar effect in one of my patients.  My recommendation would be to see an oculoplastic surgeon for a thorough eye exam and help elucidate what is going on further.Hope this helps!

Botox lasts from 3-5 months. Some patients report it lasting longer, a few shorter. After injection if it escapes into tissues around the muscle that helps elevate the eyelid, you get a ptosis. Avoiding this is technique-dependent. It also appears that you have some brow asymmetry as well which can be due to Botox but this might have been a pre-injection finding. I assume you're going to look for a new injector. If you had Botox injected into other places at the same time and those muscles has since regained function, but your eyelid and brow have not recovered, you're going to want to get a second opinion from a new injector anyway. I recommend a Board-Certified Facial Plastic, General Plastic Surgeon, Oculoplastic Surgeon or Dermatologist.Good luck!  Harry V. Wright MD