This is noted as a common and serious side effect that many people experience. Unfortunately it's also noted as a symptom of the common diseases these medications treat. It's seemingly a mess of figuring out what parts of suffering are medication related or disease related. This is why this discovery in the article is so fascinating - science doesn't even know what causes this in the first place, thus it's impossible to decipher which is which. We just know it can address some symptoms in some people and in general some feel the tradeoff is better.