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Muscle Contractions After Botox
Muscle contractions or twitching after Botox usually happen because the treated muscle isn't fully paralyzed and is still firing while adjusting to its weakened state, or because nearby untreated muscles are working harder to compensate. In the forehead, for example, the frontalis muscle normally helps hold up the brow and upper eyelid skin. When Botox partially weakens it, that support decreases, and some patients notice increased eyelid heaviness or hooding as the surrounding muscles try to compensate. This is usually temporary. Botox effects generally last about three to four months, and as it wears off, muscle balance returns to baseline. If contractions are painful, asymmetric, or affecting your vision, you should be seen sooner rather than waiting it out. For future treatments, let your injector know about this reaction so dosing and placement can be adjusted. An in-person exam is the best way to sort out exactly which muscles are involved in your case.
Clinical Context
Some twitching or heaviness after Botox is common as the treated muscle adjusts and nearby muscles work differently. This is different from eyelid drooping caused by dry eyes, a headache, or an unrelated nerve issue. If the movement or heaviness is right where the injection was given, it's usually part of the normal adjustment period rather than a new problem. Still, any new weakness, vision changes, or symptoms spreading beyond the treated area should be checked by your injector promptly rather than assumed to be routine.
