The doctor-patient relationship is violated by Dr. Benjamin's romantic impulses toward Chloe and by his intense jealousy of anyone who comes near her, including Ted Caruso, an arrogant Broadway actor with whom she has become involved.

Benjamin's work begins to suffer as he abandons patients like Mrs. Mondragon, finding her tedious, and treats the paranoia of another, Marvin Zuckerman, by designing a peculiar handmade hat for him to wear.

Sellers's death in July 1980, before Romance of the Pink Panther had even started production, meant that his roles in both Lovesick and 1984's Unfaithfully Yours went to Dudley Moore.

[5] Film critic Vincent Canby wrote in his review, "Mr. Moore and Miss McGovern are such appealing lovers that the movie successfully bypasses all questions of ethics.

"[2] Book editors Laurence Goldstein and Ira Konigsberg wrote in their book, The Movies: Texts, Receptions, Exposures, "One looks back with nostalgia to a time when psychotherapists are not fools like [...] lovesick fools like Dudley Moore [...] Psychotherapists were certainly portrayed as comic and horrific figures in earlier films, but they were a good deal of respect than in recent years.