In the Philippines, senior citizens are entitled to a 20% discount on prescription and over-the-counter medications. When accompanied by a companion, seniors can still enjoy their discount; however, the companion cannot use the discount on behalf of the senior. It's essential for the senior citizen to present their valid ID or Senior Citizen Card to avail of the discount. For specific pharmacy policies or additional benefits, it's best to check directly with the pharmacy or consult the official government guidelines to ensure compliance with local regulations.