Side-effects are generally mild for Eriacta and are similar to other sildenafil citrate medications. Side-effects in clude headaches, facial-flushing, palpitations, temporary changes in colour perception and increased sensitivity to light. Side-effects can be reduced by taking the tablet with water and drinking additional small glasses of water during activity and avoiding alcohol. Sometimes people have reported stronger temporary side-effects such as: congestion, diorrhea and fainting. These are rare.