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From the other replies it sounds like it's just a typo, but to be fair, the quote isn't really a contradiction as it is written; jumping off cliffs is known to be dangerous, but it also almost guarantees that you won't die from a heart attack!

Given the context (especially other quotes from Dr. Dodson) I think it's reasonable to assume that the word "not" was dropped, i.e. "Cardiologists know that these medications are NOT dangerous".

Acutely, in a large dose they are harmful. Long-term chronic exposure at a therapeutic dose monitored by a physician is not associated with harm.

The monitoring is critical. You are both having a heart attack and not having one simultaneously, by having the doctor observe you, you collapse the heart attack wave function and come out the other side not having had a heart attack.

Seems like an editing error, the second sentence should say 'not dangerous' (going by his quotes elsewhere in the article).

Danger of abuse?