Then I wanted to try every NMDA antagonists existing other than ketamine, like memantine, used as alzheimer treatment, but also ephenidine, diphenidine, methoxphenidine and later MXPr, all present in research chemical scene.

Then I heard about dextromethorphan (DXM) on a drug forum about anecdotical experience on its potential as antidepressive and even read a scientific paper about it. It is used as composent in cough syrop worldwide and, according to country laws, available without legal restriction or not, mainly because it is reputed for its potential of abuse for its dissociative effect.

In Belgium, it is supposed to be unrestricted for possession and use and so I bought 100gr of it on Alibaba for 80€, transport comprised...

The molecule seemed promising because it could act as antidepressive in 2 complemental chimical processes, that you can fine tune with the ingestion of pink (or is it white ?) grapefruit and other citrus having the same chimical properties, leading to the greater degradation or not of DXM while digesting, the product of degradation also having anti-depressive properties on its own, but in a different way.

The package get unfortunatelly blocked at French custom border. Now it seems I'm blacklisted in european custom as most of my order from China is systematically blocked.

Here are some ressources :

https://www.vice.com/en_us/article/9kzkje/dxm-cough-syrup-an...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6398352/

https://sci-hub.tw/https://doi.org/10.1016/j.mehy.2011.02.00...

https://mhc.cpnp.org/doi/full/10.9740/mhc.2019.03.076

Edit : Typo and removed an irrelevant reference.