Covonia Cold & Flu Formula Covonia Cold & Flu Formula relieves cold & flu symptoms, including aches & pains, headache, blocked nose & tickly sore throat & chesty coughs. It contains four active ingredients to help you get on with your day: Paracetamol: an analgesic for pain relief. Phenylephrine hydrochloride: a decongestant to help you breathe more easily. Guaifenesin: an expectorant which loosens phlegm. Cetylpyridinium chloride: an antiseptic to ease tickly sore throats.