Fortunately with Botox injections this look will not be permanent. This occurs when the forehead is overtreated and the brows drop. It is usually when people have horizontal wrinkles on their forehead and want to get a smoother forehead. The frontalis muscle elevates the eyebrows and causes the forehead wrinkles. By placing Botox in the muscle and over-weakening it the eyebrows will drop. This is an indicator that a browlift may be in your future if you want to have a smoother forehead. Rest assured though, your eyebrows will come back their normal position. Best Wishes.
Heavy brows after Botox is related to: too low an injection, too much Botox, or unrecognized brow problems before injection. Many doctors are tempted to inject foreheads which have a lot of creases but don't realize that the patient needs to lift brows to keep excessive overhanging lids from obstructing their vision. If they inject these people, they will have a wrinkle free patient but an angry one because of low lids/brows. Best to give very little or nothing to these patients. In all case this gets better though.