It should be medical effects. There are always some positive and negative aspects of medical products. So, it should be effects and not affects.
*affects
"Affects" fits better in this sentence. "Affects" is a verb that means to influence or have an impact on something or someone. "Effects" is a noun that refers to outcomes or results.
(Affect is normally a verb and effect is normally a noun.) "A major earthquake affects a large region, but the effects depend on the terrain." "This drug affects the liver, so report any painful effects to your doctor."
effects
effects of medical quackery
effects of medical quackery
what are the side affects to this product?
it affects liver.
name a medical condition associated with inactivity that effects the heart
Ewing's sarcoma is the one that typically affects children.
it adversely affects the balance of the environment
It affects society in every reason