Drug interactions with niacin atenolol vit c magnesium iron Zoloft (sertraline) melatonin and armour?

Epocrates check. A quick check on my trusty med database program reveals 3 main negative interactions with those meds listed. Two of them are with armour. The armour interacts with both the iron and magnesium making the thyroid med less absorbed, so separate these vitamins from your armour by at least 4 hrs. The other major interaction is atenolol and niacin. Less cholesterol lowering effect and overlowering of bp.
Interactions. You can use an interaction checker when you have questions about drug interactions with herbal or natural medications. NaturalDatabase.com is one example: http://naturaldatabase.therapeuticresearch.com/nd/search.aspx?s=nd&pt=7.