How long will the side effects of Botox take to go away?

Botox is amazing at getting rid of wrinkles with natural results.  Botox is used to treat migraines.  However, there have been cases of Botox causing migraines.  The other systemic side effects you are describing are concerning and I would consult a neurologist for a thorough examinatin.

As has been previously stated, headaches after Botox injections can happen but are usually easily managed with anti-inflammatory medication such as Ibuprofen. If the injection was made around the eyes, puffiness can result for a few days but it typically resolves in a few days. I am not sure how to explain your other symptoms. I would follow up with your primary physician regarding leg weakness, dry mouth etc.

Having a headache after Botox that lasts for several days is not uncommon. Occasionally, these injections can start a mild migraine in patients with a history of headaches.  This usually goes away after a few days and typically can be managed with ibuprofen/tylenol or similar headache medicine.  The other symptoms are more unusual and may or may not be related.  The puffiness/swelling around the eyes could be due to the injection if your injection was around the eyes but this should go away after several hours or possibly days in some patients that are sensitive to injections--cold compresses may help.  If you didn't have an injection around the eyes, it is likely unrelated.  If the symptoms do not go away, you should visit with your primary MD to see if there is another cause for all of your symtpoms.

People sometimes do get a headache right after Botox, but it's not something a dose or two of ibuprofen can't fix. The rest of your side effects are, I would say, not normally reported. They are extreme, especially for a "small dose" like you said you had. When these types of things are reported they are reported from extreme amounts of Botox, which are not the amounts we use in cosmetic treatments. You can call Allergan and report your side effects if you'd like and discuss the situation with them. To answer your other question though, I would expect any side effects like this to go away quickly, but Botox lasts 3-4 months. "This answer has been solicited without seeing this patient and cannot be held as true medical advice, but only opinion. Seek in-person treatment with a trained medical professional for appropriate care."