Piribedil (trade names Trivastal, Pronoran, Trastal, Trivastan) is an antiparkinsonian agent and piperazine derivative which acts as a D₂ and D₃ receptor agonist. It also has α₂-adrenergic antagonist properties.

The drug has been shown to enhance working memory capacities in normal aging adults.

In age-related memory impairment, it has a positive effect on psychophysiological state of elderly people, improving memory and attention and increasing the velocity of psychomotor reactions and lability of nervous processes.

It enhances cognitive skill learning in healthy older adults.

It showed a positive effect in restless legs syndrome

Administration of piribedil should be initiated with one tablet daily during the first week. Dosage should then be gradually increased every week until achieving the optimal therapeutic dose:

One tablet daily at the end of the main meal. In severe cases: two tablets daily in two doses.

Dopamine antagonists reduce the effect of piribedil.

At very high doses, piribedil has an emetic action on the chemoreceptor trigger zone (CTZ). Tablets will thus be rapidly rejected, which explains why no data are currently available concerning the risk of overdosage.

Shahrukh Khan (pronounced [‘ʃaːɦrəx ˈxaːn]; born 2 November 1965), often credited as Shah Rukh Khan and informally referred to as SRK, is an Indian film actor. Known as "The King of Bollywood", Khan has acted in over 70 Hindi films. He has won fourteen Filmfare Awards from thirty nominations for his work in Indian films and shares the record for the highest number of Best Actor awards with Dilip Kumar, eight wins. In 2005, the Government of India honoured him with the Padma Shri for his contributions towards Indian cinema.

After graduating with a Bachelor's degree in economics, he started his career appearing in theatre and several television serials in the late 1980s and later made his Hindi film debut in 1992 with Deewana. Early in his career he was recognised for his unconventional choice of negative roles in films such as Darr (1993), Baazigar (1993) and Anjaam (1994). Since then he has played leading roles in a wide variety of film genres, including romantic films, comedies, thrillers, action films, sport films, and historical dramas among others.