James D. McMahan, M.D., F.A.C.S.
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What are the most common risks of Botox® injections?

Since Botox® is injected with a fine needle, it is possible to injure small blood vessels during the injection process and therefore bleeding and bruising is a risk. It is relatively rare to see bruising in the brow area which is the most common area for Botox® injections; probably because the area is quite thick so that a deep bruise may not be visible on the surface of the skin. Bruising is more common on the forehead because the area is thinner and more injections are given in that area which increases the risk. The crow’s feet near the eyes and lower eyelids have the thinnest skin and are where bruises are seen most commonly.

To reduce the risk of bleeding, it is helpful to avoid taking any medication that can thin the blood such as aspirin, vitamin E, ibuprofen, etc. for at least a week before treatment.

Incomplete correction of wrinkles is always possible and can be corrected with another injection but it is best to wait at least one week to make sure that it is not just a delayed response.

If Botox® leaks down from the brow into the eyelid it can cause drooping of the lid. This is one of the most feared complications of Botox® injections but fortunately occurs in about one out of every two or three hundred treatments. It generally only lasts for two to three weeks and can be improved with over the counter eye drops containing naphazoline hydrochloride. To avoid this problem, patients should avoid rubbing the area that was injected and they should not perform strenuous activity for at least two hours after their treatment.

When the transverse lines in the forehead are treated with Botox®, the muscle which elevates the brows is weakened which can cause the brows to sag. Patients with low brows to begin with should either avoid Botox® in their foreheads or at least have a more conservative treatment.

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