Is it bad to take Dimetapp while on oxycodone?

I was given oxycodone about 3 hours ago for post-operative pain and I've also got a bad cough. Would it be a terribly bad idea to take Dimetapp now? I'm also going to be taking Tramadol later tonight, will it react badly with that?

: http://alcoholdrugstreatment.info/is-it-bad-to-take-dimetapp-while-on-oxycodone-2