The chemical name of Contac is Compound Phenylpropanolamine Hydrochloride Extended-Release Capsules, which has a strong vasoconstrictor effect and can quickly relieve cold symptoms such as runny nose and nasal congestion. Phenylpropanolamine rapidly constricts tiny blood vessels throughout the body and increases blood pressure, so it is contraindicated for people with severe coronary heart disease, a history of mental illness, or severe hypertension. The elderly is not a contraindication to the use of Contac, but the elderly are prone to heart disease, hypertension and other diseases, so the elderly in the use of Contac before, it is best to know whether they have serious cardiovascular disease, not clear when it is best to consult with a physician or pharmacist. White plus black is also called Meibiao pseudo-maize tablets, white tablets during the day, black tablets at night. It is a compound preparation containing paracetamol, pseudoephedrine, dextromethorphan hydrobromide, and phenylephrine hydrochloride, which has the effects of antipyretic, analgesic, analgesic, anti-allergic, and sedative. It is used to relieve fever, headache, nasal congestion, sore limbs, runny nose, sneezing and coughing caused by colds. The drug is contraindicated for people with severe liver and kidney insufficiency. White plus black does not contain sugar, itself does not cause elevated blood sugar, but paracetamol has the effect of fever, fever will have a large amount of sweat evaporation, diabetic patients can be due to the loss of water in the body and cause elevated blood sugar. Therefore, when sugar patients use white plus black, they should pay special attention to replenish enough water, so that the impact on blood sugar will be very small.