allergic rhinitis
"I found this helpful in relieving the excess production of mucous and the resultant post-nasal drip which caused an irritating and continuous need to cough up phlegm. However I have not been using it for very long (3 weeks at 1 tablet per day taken in the morning) and twice have experienced light-headedness requiring me to hang onto something and to sit or lie down before I fall down. I normally have fairly low blood pressure but not sufficient to feel I am about to faint."