I think you can get away with quitting it cold turkey after a brief usage but still wouldn’t recommend it. Or maybe a long extended usage with little or no breaks between going by some experiences on here.
However I had extreme anxiety, manic nightmares and the ‘crash’ after stopping suddenly, only 'cos I’d misplaced the supply, had been intending to lower/space out the dosage. I can’t be certain that’s what caused all my problems since but I’m certain they would have been a lot lessened without this sudden shock to the HPTA/adrenals. Most people here with severe symptoms followed the same path.
Anyone in the medical field will tell you suddenly stopping a drug is the worst thing you can do, just look at some people who’ve done this with SSRIs. Unfortunately for some of us fin users this method has particularly devastating consequences. Chronic ED is currently the least of my worries.