Can paracetamol daily once for 15days effect liver am having costochrodotitis??? 500mg * 2 times am male 21years weight 80kg

Paracetamol. Based on what you say you are taking 1gm of acetaminophen a day. This is quite an acceptable dose. You should not expect to have any issues with the liver - unless you take alcohol or take any other acetaminophen containing medications as well.