I don't agree with everything RFK Jr says but I think the mainstream media owe him an apology on this account. I have had many patients say that they found coming off antidepressants harder than coming off heroin. And now there is large-scale data to back up those anecdotes.
This of course is distinct from addiction. The pre-requisite for withdrawal is physical dependence which is a predictable physiological response that is the consequence of adaptation to a drug. Physical dependence does not involve compulsion, craving, etc.
Opioids cause addiction because of their reinforcing euphoria which antidepressants do not do. But they are both cause physical dependence and evidently comparable levels of withdrawal for the higher risk antidepressants.
In an analysis of drug withdrawal to the FDA adverse effects database here were the signals for the 20 drugs with strongest risk of withdrawal. Paroxetine, duloxetine and venlafaxine where in the top 20. Paroxetine was no. 4, above several opioids.