Initially, after my first and only dose, I noticed the very unfavorable taste, and slight waves of nausea coming on. Within 1-2 hours, I was vomiting non stop. I could not hold down my own saliva. I'm assuming that my bad headache was a result of constant straining. By 3 pm I was completely useless, already too weak to drive to the hospital. I knew I had to find a way to get hydrated. I gave up on trying any fluid for a while. I decided to try Gatorade and I could tell, from my body's feedback, that I needed some of its ingredients. Held it down better than water. The Doctor on call called in Zofran and a headache medicine. Then, recovery began. It is the following morning and still mild nausea, but that's the only side effect that is out of the ordinary. I believe that I can see how asterpro could dry out your sinuses. If your body isn't made to accept asterpro, then it could dry up way more than sinuses.