I posted last Friday night about my 4 year old daughter's Singulair experience. Just wanted to add a note that my daughter was actually on it for 16 days - forgot to include the free sample. Her last dose was last Friday. She had one more hallucination experience on Saturday evening. Sunday she developed an unexplainable itchy rash behind her ears and along her jawline. I gave her some Benadryl. Monday morning the rash is not as severe or itchy. This evening she is in very good spirits and ate quite well too.