The 1 Feb 1963 DV announced that producer Leon Fromkess was moving his headquarters on 4 Feb 1963 from Allied Artists Studios to Producers Studio, both located in Hollywood, CA. His first project at the new location was referenced by the working title, The Long Corridor. Principal photography started 18 Feb 1963, as stated in the 22 Feb 1963 DV production charts. The 21 Feb 1963 DV noted that the film would mark actress Constance Towers’s motion picture singing debut. On 27 Feb 1963, DV reported that Richard Morley resigned the presidency of Creative Associates to join Fromkess on the production. The article did not specify the nature of Morley’s duties. Five days later, the 4 Mar 1963 DV noted that twenty-five background actors were hired for a week’s work on the picture. Filming was completed within the month, as indicated by the 10 Apr 1963 Var, which stated that lead actor Peter Breck was hospitalized following his physically challenging role.
       On 15 May 1963, DV reported that composer Paul Dunlap would begin recording the score with a forty-piece orchestra the next day. According to the 20 Jun 1963 DV, Constance Towers released “Cathy’s Theme” on Diamond Records, written for the picture by Dunlap. As noted in the 23 Aug 1963 DV, she also voiced Spanish-language radio advertisements for the film, and joined fellow cast members Peter Breck and Hari Rhodes on a promotional tour, according to the 7 Oct 1963 DV.
       The 21 Jun 1963 DV announced the official title as Shock Corridor. The film premiered 11 Sep 1963 in New York City, as stated in the 28 Aug 1963 Var, followed by the 9 Oct 1963 opening in Los Angeles, CA. Reviews were lukewarm, several of which described the portrayals of severe mental illness as unconvincing. The 14 Aug 1963 Var reported that the Catholic Legion of Decency declared the picture “morally objectionable in part for all.” According to the 16 Sep 1964 Var, Swedish censors took even greater offense, banning the film entirely.
       Regardless, a news item in the 11 Sep 1963 DV claimed it was the “fastest booking” film in the history of Allied Artists, with engagements in “every key city” across the U.S. In addition, the 18 Sep 1963 Var reported earnings of $147,585 from five New York City theaters during the opening weekend. Speaking to the 18 Sep 1963 Var, writer-producer-director Samuel Fuller attributed the picture’s success to its topical content, and advised his fellow filmmakers to draw inspiration from current events.
       On 21 Jul 1963, NYT revealed that Twentieth Century-Fox Film Corporation had plans to produce Shock Treatment, based on a novel by Winfred Van Atta, with a plot very similar to Shock Corridor, for which Fuller took sole credit.
       Casting announcements included Felix Silla (1 Mar 1963 DV), Dolores Domasin, Leslie Summers, and Deana Carcia (7 Mar 1963 DV), and Gordon Zahler (12 Mar 1963 DV).