I had Botox done for my forehead lines. How long does this tightness and heaviness last?

If you have never had Botox for forehead wrinkles then the stiff feeling that may occur is a new to you.Normally, you lift and furrow the forehead when you animate.  The object behind Botox is to soften these lines and calm down the wrinkling.  Hence, the muscles that produces these deep wrinkles are now less active. You should accommodate to this feeling in days to a week, afterwards you will enjoy a tension free appearance. 

Doing botox for forehead wrinkles can leave some patients unhappy because it does sometimes cause more heaviness of the brows (the muscles that elevate the brows are paralyzed by the botox and no longer function as they should).  As far as tightness, I am assuming that you are referring to your skin being more firm and less wrinkled, but I'm not as sure how to answer that question as I'm not entirely sure what you are referring to.  In most people, the duration of action of Botox is approximately 3 months, so you should start to notice some improvement in the heaviness by at least month 3 after injection.  I wouldn't necessarily give up on Botox injections for your forehead wrinkles, but it may need to be injected a little higher in your forehead to avoid the heaviness feeling.  Best of luck!

Botox can be a great option for the treatment of forehead lines. If too much is injected or if the injections are too low on the forehead, there may be the sensation of heaviness and the eyebrows can drop. This often clears up within a month. Should this be your situation, make sure future injections are only given in the upper half of the forehead. I hope you find this helpful. 

Some people do feel tightness and heaviness after the initial injections, it seems to only last a week or so then the brain gets used to the new relaxation of the muscles.

Botox is a great injection for treating forehead lines.  However, you can sometimes feel that the forehead is tight or heavy.  This may be product placement or the amount of product that was placed.  As the Botox wears away you will feel relief from this side effect.  It can take anywhere from a month to soften and up to four months to resolve completely.  If "baby" Botox is used, there is less of a chance of this side effect.