Is it normal that Botox is not taken on one side after a top up?

Usually the cause of one side being relaxed and one side able to contract in the same anatomic zone in the same individual is that enough units were not placed in the "awake" side. The information provided in Dr. Shelton's answer is for educational purposes only and is not intended to constitute medical advice.  The information provided should not be relied upon as a substitute for consultations with a qualified health professional who may be familiar with your individual medical needs. 

It typically takes one to two weeks to see the full results of Botox. See your doctor for an in-person evaluation.

Hi,Thank you for your question.Botox can take up to 2 weeks for full results. Even touch ups take effect at slightly different rates depending on the muscle strength.Although less common, if you happened to get a bruise or the botox was injected into a vessel accidentally, you may not have much improvement on that side. As always, follow up with your injector for re-evaluation at 2 weeks.Hope this helps!