I took a muscle relaxer (low dose) due to a sprain in my back.. i typically take 10mg of prozac every morning. will this have an interaction?

Without knowing what muscle relaxer you actually took, it is impossible to check to see if there could be a drug interaction between them. Could you resubmit the question with the actual names of the medication‘s? Good luck.

The concern is whether you took a muscle relaxant that has tricyclic properties such as cyclobenzaprine (Flexeril). If it is cyclobenzaprine then is is not good to take with Prozac since it could potentially lead to a serious but rare condition called Serotonin Syndrome. This syndrome may include symptoms such as confusion, hallucination, seizure, extreme changes in blood pressure, etc.