Blue Sunshine (1978) on Netflix

Wendy Flemming, the ex-wife of Congressional candidate Ed Flemming, and surgeon David Blume, do not travel in the same social circle, but both have been suffering from slow hair loss and migraine headaches of late. Frannie Scott is at an advanced stage of whatever is afflicting Wendy and David, Frannie who has lost all his hair which his friends do not know since he wears a wig. Frannie goes on a murderous rampage one evening, a rampage that his friend Jerry Zipkin witnesses and tries to stop. Frannie is killed in an accident, but his death and that of the three women he killed is pinned on Jerry, who goes on the run from the police. When Jerry reads in the news of another man who seemed to go through much of what Frannie did and who murdered his family before being killed himself, Jerry goes on a search for answers as to what happened to Frannie to make him turn psychotic, and if Frannie's affliction is related to this other man. By Jerry's side on the sidelines is his friend David - who only knew Frannie distantly through Jerry - and Jerry's girlfriend, Alicia Sweeney, who knows Jerry is innocent. Through his search, Jerry believes that everything points to activities of Ed Flemming ten years ago at Stanford University, activities which he would deny as it would ruin his election chances, and something called Blue Sunshine. Regardless of Ed Flemming's cooperation or not, Jerry tries primarily to clear his name and find out what's happening so that he can stop further murders from occurring.