Botox, Vistabel, Bocouture and Dysport are all medical grade purified and stabilized botulinum toxin A products available at the moment. To start with, make sure that you are being injected with a dependable product such as these and also that the physician treating you has ample training in Botox procedures. It is further advisable to have your treatment performed by physicians who perform these procedures on a daily basis to ensure your safety and results.
Complications can arise from injections being placed incorrectly or doses being calculated incorrectly which can lead to incorrectly weakened muscles resulting in brow drop, eyelid drooping, uneven brows and even blurred vision.
The most common risks are bruising at the injection sites and perhaps a headache for a few hours to days afterwards. Infections at the injection sites are unheard of and I have never seen an allergic reaction either. The dose of botulinum A injected is far too small to cause any system effects and is safe even at high cosmetic doses, however we do not recommend having this treatment when you are pregnant, as no official risk studies have been undertaken in this case.