In case of emergency the number to call in Denmark is 112 as in most european countries.
Calls to 112 are free from public phones.

Chemist's shops are identified by a green "a" (Apotek).
The main drugstore in Copenhagen is open 24/7.

Steno Apotek
6C, Vesterbrogade
1620 Copenhagen V
Phone: +45 33 14 82 66