A lot of people who are experiencing side effects seem to have been prescribed a high dose of this medication. I am usually severely affected by prescribed medication (dry mouth, hallucinations, seizures, rashes etc- the lot!!!); that other people feel fine off. I don't think pseudophedrine is dangerous unless you have a high dosage. Its like with everything, any medicine can become a poision if you take enough of it. It is probably best to ask for a low dose instead. I'm taking 60 mg and its my first day- feel fine and congestion is loosening.