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Erica, the normal dosage is 5-7.5 mg at bedtime. If I have understood you correctly, you have taken 20 individual tablets of 7.5 mg each. Additionally, you took some benadryl
If this is correct, CALL AN AMBULANCE IMMEDIATELY FOR TRANSPORT TO THE NEAREST HOSPITAL.
You have taken an overdose! URGET! This is a life-threatening emergency.