Medicine is the best way to reduce phlegm, and using a suction device will cause dependence, and then it will be even more difficult to cough up, and it is also very easy to get infected and cause cardio-pulmonary complications
Manual assistance can be used to help, the palm of the hand slightly curved in the shape of a spoon, and then the left and right hands repeatedly knocked on the upper back of the lungs, the attention of the road should not be whack, but repeatedly knocked for 2-4 minutes, which will help to cough up the phlegm. This method is even long-term bedridden people without autonomy are very effective, I hope to try it first