Well you need to understand that Doxepin is NOT a sleeping pill, it isn't supposed to just knock you out. It is an antidepressant, that has the side effect of causing drowsiness and helping you to fall asleep. If it isn't working for you, you shouldn't just jump and double your dosage, you should talk to your doctor, and together you can find something else to try, to help you with your sleeping problems.
Overdose
Symptoms:
Excessive drowsiness leading to minor alterations of consciousness and even unresponsiveness could be an early indication of excessive dosage. However, overdosage with doxepin is more likely to be manifested by increased psychomotor agitation and convulsions leading to apnea and coma. The ECG changes (broadening of QRS and T-wave abnormalities) tend to be a late finding and are not always accompanied by cardiovascular hemodynamic changes.
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