What happens if you take 100mg of citalopram at once?

Most people experience no side effects to this medication, You might feel tired, light headed, or slightly dizzy until the medication wears off.

Watch for common side effects, including:

Decreased sexual desire or ability; diarrhea; dizziness; drowsiness; dry mouth; increased sweating; lightheadedness when you stand or sit up; loss of appetite; nausea; stuffy nose; tiredness.