There are three ways to read Italian literature before your Italian is ready for it. They are not interchangeable, and most people pick the wrong one for where they are.
Dual-language editions
Original on the left, English on the right. The Dover series is the best known, running from Dante and Boccaccio to Pirandello.
What it does well. Nothing is altered. You are reading the actual sentences, and for poetry that matters more than anything else. It is also the only format that lets you check a difficult line without breaking off.
What it does badly. Your eye goes right. Not sometimes: constantly, and without your permission. You end up reading the English and glancing at the Italian, which builds appreciation but very little fluency.
The publishers are honest about the other limitation. The Dover reader states plainly that the excerpts are not retold or simplified, and that a solid grounding in grammar is needed to get the most from the original. That is a fair warning and worth taking seriously.
Use it for poetry, for short passages, and as a second pass over something you have already read. Do not use it as your main way of reading a novel.
Adapted graded readers
The text is rewritten to a level: vocabulary controlled, sentences shortened, structures kept within what a learner at that stage has met.
What it does well. You read the whole book. That sounds modest until you compare it with the number of unabridged novels you have abandoned. Volume of input is what moves reading ability, and only this format gives you volume.
What it does badly. Something is lost, and with a great stylist a lot is lost. An adapted D'Annunzio is not D'Annunzio.
There is also a real objection about content. Most commercial graded readers are invented stories written for the purpose, and an adult who reads seriously in their own language finds them thin. That objection is correct, and it is the reason I adapt real classics instead: the plot, the characters and the moral weight survive adaptation even when the prose style does not.
Use it as your main reading, at every level up to C1.
Unabridged originals
Use them when you can read a page and meet three to eight unknown words. Below that threshold you are decoding, and decoding is not reading.
Most learners reach for this format at least two years too early, usually out of a sense that anything else is cheating. It is not cheating. It is sequencing.
What I would actually do
Adapted editions as the main diet, all the way through. A dual-language edition on the shelf for poetry and for rereading. And the original when the three-to-eight rule says you are ready, which for most people arrives somewhere in B2.
Then read the same book twice, years apart, once adapted and once whole. Noticing what came back is one of the genuine pleasures of learning a language as an adult.
Which classic sits at which level is set out in this article, and the series itself is here.
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