Can you take melatonin and doxcepin same time?

The short answer is 'probably.' The reason for the ambiguity is that doxepin has very wide-ranging effects depending on your age, your level of depression, and the dosage prescribed.

Melatonin on the other hand, has almost no verified side effects, (the only consistently reported is 'vivid dreams') Remember that melatonin is naturally occurs in your brain already. Now whether you should increase your circulating melatonin with a supplement is a question for your doctor, speaking of your doc; You should be asking yourself (& your caregiver) whether you really want to be taking doxepin at all, to be honest. It has a long list of nasty side effects, and unless your suffering from depression serious enough to be physically dangerous, the risks of continuing with doxepin may outweigh the benefits.