over the counter
US /ˌoʊvər ðə ˈkaʊntər/
UK /ˌoʊvər ðə ˈkaʊntər/

1.
referring to medicines that can be bought without a prescription
:
•
You can buy pain relievers over the counter.
•
Many cold and flu remedies are available over the counter.
2.
referring to financial transactions conducted directly between two parties, rather than through an exchange
:
•
Many derivatives are traded over the counter.
•
The company's shares are traded over the counter, not on a major exchange.