Fenethylline

What the body turns Fenethylline into, as its Wikipedia article records it.

Quoted from Wikipedia, not yet written up by hand. Its infobox gives no timings, so this shows only what the article text says it turns into.

hoursfrom the article text
What else it turns into
“It is a phenethylamine derivative which is thought to act as a prodrug of DOC and theophylline in the same way in which fenethylline acts as a prodrug for amphetamine and theophylline.” ¹

Source

Half-lives vary between people, doses and routes. This page explains what the body does with a drug. It is not dosing advice.