Usually, the effects of botox last for 3-4 months. It is unusual to have a return of movement so quickly. But, if this is the first time that you have been injected, it may be a sign that you need higher than the usual dose to achieve the desired result. Make an appointment with your doctor to discuss your concerns and to see if more treatment areas are necessary for you. Good luck!
There are many reasons for this.I have seen this with Botox. Some responses last for 6-8 weeks and in some rarer cases the response is non existent.These groups of patients are referred to as Partial responders and non responders respectively.If your body has developed an antibody against the Botox Protein then your response is shortlived. Try changing to Xeomin which is a Next generation Toxin and has no protein molecule binding it.All the best