I just don't trust doctors. They're not always right. Sometimes they prescribe a medication just because they get certain allowances from the pharmaceutical companies, not that it would be best for the patient. In some cases just a change in diet is enough to cure what ails you, but doctors just wanna shove pills down your throat. As for cold medicine, I have the idea in my head that it doesn't really allow your immune system to fight the cold off thus weakening your system. I stopped taking that stuff entirely and I rarely if ever get sick anymore.