There are minimal side effects with neurotoxin injections. Most patients experience some bleeding, bruising, swelling, redness, or pain at the injection site, but these symptoms usually fade within hours after treatment.
We instruct patients not to rub or massage the treated areas for 24 hours. This advice is to keep the toxin from spreading to another area of your face where you don’t want the muscles to relax. If spread occurs, it can result in temporary facial weakness or drooping.
Other side effects are extremely rare. Eyelid drooping occurs in 3% of patients treated for frown lines, and 1% of patients experience eyelid swelling from crow’s feet injections. Other possible negative effects such as dry mouth, tiredness, headache, neck pain, eye problems, muscle weakness, and allergic reactions can also occur.
Certain medications may adversely interact with neurotoxins as well, including prescription and over-the-counter medicines, vitamins, and herbal products. It’s crucial that you let your doctor know about all the medicines and treatments you use to ensure a safe and effective experience.