Singulair Side Effects: serious itching, hallucination feeling like bugs crawling over my http://www.medications.com/effect/view/38887 serious itching, hallucination feeling like bugs crawling over my skin mostly elbows and behind knees, numbness in feet and surface of skin on fore arms, fatigue, headaches Please report your adverse reaction to the FDA. https://www.acces Thu, 12 Feb 2009 20:31:00 +0000 http://www.medications.com/effect/view/38887?item=17024 Please report your adverse reaction to the FDA. https://www.accessdata.fda.gov/scripts/medwatch/medwatch-online.htm. They are still investigating Singulair's side effects and every report makes a difference. Thank you. http://www.medications.com/effect/view/38887?item=17024