Botox is very safe, but like any procedure, there is some risk for complications. Make sure you tell your provider about any medical conditions you may have, as well as any medications you’re currently taking. Don’t get Botox for hyperhidrosis if you’re pregnant or breastfeeding. Possible side effects can include: Dry mouth Headaches Fatigue Neck pain Rash due to an allergic reaction Loss of appetite Chills Trouble swallowing Nausea Itching