Could I Have Post-Botox Side Effects Due to Taking Gabapentin?

Patients who have not taken gabapentin, have reported, although not commonly, headaches after botox and drooping is occasionally seen related to where the botox is placed and how much volume is injected depending on the dilution factor.  If the needle is placed against the periosteum of the bone during the treatment it may increase the prevalence of developing headaches after the procedure and if a nerve is irritated then maybe numbness might be experienced but this is theoretical as I have not heard of this side effect. You should see your doctor for an evaluation and then if it still persists, see a neurologist. Certainly see the neurologist quickly if the symptoms escalate as these symptoms are not necessarily related to the botox and you may need to make sure it's not a coincidentally occuring serious condition.

Typically, botox does not interact with any other drugs when it is injected into the muscles of the forehead. However, anything is possible although highly unlikely. Now, one of the more common side effects of botox is temporary brow ptosis or decline of the brows especially if some diffuses from the intended location. This should resolve usually within 2 to 4 weeks.

Lowering of the eyebrow after botulinum toxin injections is not uncommon and is typically related to the placement of the product.  Headaches have been reported after injection but typically resolve relatively soon after injection.  I am unable to explain the numbness as I feel this is unlikely to be related unless the nerve itself was touched by the needle (very uncommon but I suppose possible).  I do not believe that gabapentin had anything to do with the effects you are experiencing.