Medicare prescription drug coverage is insurance that helps people pay for prescription drugs at participating pharmacies. It is available to everyone who has Medicare. It provides protection if you pay high drug costs or have unexpected prescription drug bills. It doesn't cover all costs. You have to pay part of the cost of prescription drugs. Most people also have to pay a monthly premium and a yearly deductible for the coverage.
Private companies provide Medicare prescription drug coverage. You choose the drug plan you like best. Whether or not you should sign up for the coverage depends on how good your current coverage is. You need to sign up for coverage as soon as you are eligible for Medicare. Otherwise, you might have to pay a penalty.
Centers for Medicare and Medicaid Services
References and abstracts from MEDLINE/PubMed (National Library of Medicine)