According to the package insert for Botox Vista, patients currently undergoing treatment with another Botulinum Toxin formulation are advised not to receive treatment with it2. This is due to the potential interactions and lack of established safety between different formulations, which could carry a risk of enhanced effects. However, in practice, there is no evidence suggesting that adverse effects are exacerbated by using different Botulinum Toxin formulations. If you are concerned, it is recommended to wait at least three months before switching to a different formulation.