I am taking suboxone and am ill so want to also take robitussin (guaifenesin) nighttime. are there any interactions i should be concerned about?

You can,: there is no drug interactions. However, Suboxone is used to treat narcotic (opioid) dependence or addiction. If you use this medication during your treatment maintenance period as directed by your doctor, you should notified him/her immediately about any medication OTC, supplements or even vitamins. Please check your contract for more information. Respectfully.