An orexigenic , or appetite stimulant , is a drug , hormone , or compound that increases appetite . This can be a naturally occurring neuropeptide hormone such as ghrelin , orexin or neuropeptide Y ,   or a medication which increases hunger and therefore enhances food consumption . Usually appetite enhancement is considered an undesirable side effect of certain drugs as it leads to unwanted weight gain ,    but sometimes it can be beneficial and a drug may be prescribed solely for this purpose, especially when the patient is suffering from severe appetite loss or muscle wasting due to cystic fibrosis , anorexia , old age , cancer or AIDS .      There are several widely used drugs which can cause a boost in appetite, including tricyclic antidepressants (TCAs), tetracyclic antidepressants , natural or synthetic cannabinoids , first-generation antihistamines , most antipsychotics and many steroid hormones .
In November 1942, the Italian cyclist Fausto Coppi took "seven packets of amphetamine" to beat the world hour record on the track.  In 1960, the Danish rider Knud Enemark Jensen collapsed during the 100 km team time trial at the Olympic Games in Rome and died later in hospital. The autopsy showed he had taken amphetamine and another drug, Ronicol , which dilates the blood vessels. The chairman of the Dutch cycling federation, Piet van Dijk, said of Rome that "dope – whole cartloads – [were] used in such royal quantities." 
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