Thank you for your post and question. Medications such as SSRI work differently on an individual basis due to brain chemistry, body type, weight, height, etc. Before answering your question, I have a few questions for you. How long were you taking Celexa at 60 mg? What made you decrease the dosage? How long have you taken the lower dosage?
Sometimes, a decrease in dosage can increase depressive symptoms because the brain is recalibrating itself to the lower dosage. If you continue to feel this depression for 7 to 10 days, I encourage you to contact your physician that prescribed this dose to see if adjustments can me made.
Please let me know if you have any further questions.