The expiration date on my bottle of doxycycline is June 23, 2015 which is 18 days ago. Will it not be effective? Will it not work anymore?

Erase After Viewing- I have a secret to tell you. Anyone looking over your shoulder? OK, close the windows and door. Pull the blinds and turn off your TV remote devices. Unhook your router. And anyone who reads this put cotton in their ears....There are a lot of medications you can take way beyond their expiration date.There are a few you can't, so it takes a little research but as far as your couple of weeks, NO PROB.