Effexor (venlafaxine) with 0.4 of clonazepam, before sleep. Feeling very dizzy and confused at night. Heart races at sleep. What should I do? Can both meds be mixed?

Side effects. While these medications can be mixed, it sounds like you are having side effects from one or the combination -- call your prescribing doctor for further advice.
Klonopin (clonazepam) Not sure if u have the correct dose of Klonopin (clonazepam) because it does not come in 0.4 mg. Please check with your prescribing doctor.