I took 50mg of atarax (hydroxyzine) 11hours ago and have not slept a wink. i took my 10mg of citalopram 5hours ago. is it safe to take 3.75mg of zopiclone now?

If no alcohol, safe: It seems to me that taking the zopiclone now would not adversely interact with the other things you have described taking as long as you are not drinking alcohol or taking other medications that you have not indicated. As always, talking with your provider is best. Ref: http://www.Mayoclinic.Com/health/drug-information/dr601455.