Phone for an ambulance and seek advice urgently. I think they will tell you to get him to drink milk so get some ready.
My Son Drank Bleach. I Am Freaking Out! What Do I Do? What Will Happen To Him?
Read the bottle and it should give you instruction on how to treat it. They will also have the poison control phone number so you can call!
1-800-222-1222
Go really fast look a any liquid bottle and call the posion control immeditely!