Can I buy medicine in a pharmacy with Dongguan social security card?

1, yes, as long as the card has money, you can buy medicine at the designated medical insurance pharmacy at any time, without restrictions. As long as you participate in employee medical insurance and pay the normal fee, you can swipe your card at the designated pharmacy of the Social Security Bureau;

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.