I take midol everytime im on my period atleast 4pills. but was reading it can cause liver damage how many would i have had to take for this to occur?

Midol: Midol Complete contains 500mg acetaminophen or Tylenol (http://www.midol.com/static/documents/WEB_Midol-Complete-Caplets-011.pdf). Assuming a healthy liver, most people can tolerate upwards of 3,000-4,000mg daily. Just beware that many medications contain acetaminophen so be sure to add up all that you take. But 4 pills a month shouldn't be an issue.