Early Development and Patents
Cyproheptadine was first synthesized in 1954 by Smith, Kline and French Laboratories (now GlaxoSmithKline) [1]. The company filed for a U.S. patent in 1955, which was granted in 1958 (U.S. Patent 2,828,663). This patent covered the compound's chemical structure and therapeutic use as an antihistamine and antiserotonergic agent.
Clinical Use and Off-Label Prescribing
Cyproheptadine was initially marketed under the brand name Periactin for the treatment of allergy symptoms, such as itching, sneezing, and runny nose. However, due to its effects on serotonin and acetylcholine levels in the brain, it has also been used off-label for various psychiatric and neurological conditions, including attention deficit hyperactivity disorder (ADHD), anxiety disorders, and migraine headaches [2].
Evolution of Patent Exclusivity
The original patent for cyproheptadine expired in the United States in 1973, allowing other manufacturers to produce the generic version of the drug [3]. Since then, several countries have lost patent exclusivity, allowing generic producers to market their own versions of cyproheptadine. According to DrugPatentWatch.com [4], the last patent for cyproheptadine expired in 2005 in some countries.
Current Market and Availability
Cyproheptadine remains available today in various forms, including tablets, capsules, and oral solutions. It is commonly used in hospitals and clinics for its antihistamine and anti-allergic properties, as well as for its off-label uses in psychiatry and neurology. Despite its widespread availability, there have been concerns about the risks of dependency and rebound headaches associated with long-term use of cyproheptadine [5].
References
[1] U.S. Patent 2,828,663 (1958) - Smith, Kline and French Laboratories.
[2] American Academy of Pediatrics. (2017). Cyproheptadine: Treatment of Childhood Allergies and Allergic Rhinitis.
[3] FDA. (2022). FDA Approved Drug Products: Periactin Tablets.
[4] DrugPatentWatch.com. Cyproheptadine Patents.
[5] Mayo Clinic. (2022). Cyproheptadine - Side Effects and Precautions.