... dry mouth, dehydration, high blood pressure, etc. I have had full body hyperhydrosis and ADHD my entire life. My vyvanse helps a lot with my ADHD but also increases my hyperhydrosis. I do not want to make myself pass out due to dehydration or have extreme dry mouth or other worsening symptoms from taking them at the same time. I was wondering if taking my vyvanse in the morning and robinul at night before bed would be okay? I have been taking my vyvanse 60mg for 3 years but I haven't started the robinul until I know what I should do. It's only a trial for 30 days but after that my doctor said my options are only Botox injections or surgery. Please help.