Sun Pharmaceutical Industries said it has received approval from the United States Food and Drug Administration to sell its generic version of Astelin which is used to treat nasal problems in North America. The company is selling the generic Azelastine HCL nasal spray which is therapeutically equivalent to Medpointe Pharm HLC s Astelin nasal spray according to a statement by the Sun Pharma. According to estimates Azelastine HCL nasal spray has annual sales of around $144 mn in the USA.The drug is indicated for the treatment of the symptoms of seasonal allergic rhinitis such as rhinorrhoea sneezing and nasal pruritus.