A while back, I wrote a blog about how prescription drugs can cause vitamin and mineral deficiencies.  Vitamin and mineral deficiencies can weaken your immunity and leave you susceptible to diseases.  Deficiencies may also cause headaches, anxiety, fatigue, and a whole host of other problems that leave you feeling yucky.  This is why, if you are taking medication or are going to take medication, it is very important for you to a) be aware of this, as doctors don't really explain this, b) figure out what nutrient or nutrients are being depleted, and c) supplement with the appropriate foods high in those nutrients and/or take the appropriate vitamin or mineral supplement.  Here are some great sites that provide the drug and the nutrients being depleted:

1.)  http://www.chiro.org/nutrition/ABSTRACTS/Nutrient_Depletion.shtml

2.)  http://www.nutrifarmacy.com/articles/alive2.html

3.)  http://www.lef.org/magazine/mag2010/aug2010_Drug-induced-Nutrient-Depletion_01.htm

Also, do your own research to see how much extra you should supplement, and for how long.  Remember, taking megadoses can be more harmful than helpful.  Talk to your doctor or health specialist.  The folks at your vitamin store can be helpful too.  And go by how you feel.  For example, if you have a headache and need to take extra magnesium, take enough until the headache lessens or goes away. 

Read What Your Doctor Won't Tell You Part 1, if you haven't already: http://www.thedoctorstv.com/GreenFish/posts/14355-What-Doctors-Won-t-Tell-You-Prescription-Drugs-Cause-Vitamin-and-Mineral-Deficiencies