Protic cough drugs block the cough center and the cough stops. But if there is phlegm, then it will only harm, since there may be stagnation and with a wet cough you need to drink expectorants and cough up phlegm, the cough in this case will be stronger. In 90% of cases, people have a wet or combined cough.
Dry cough - without phlegm, wet - with phlegm. The sputum is not necessarily green - it can be transparent, yellow, gray, brown, red. It makes sense to take ambroxol (lazolvan), acetylcysteine / carbocysteine - expectorants. The goal is to ensure that all phlegm leaves and does not remain in the airways. Of course, suppressing coughing is counterproductive. I don't know if you can choke on phlegm, but you need to cough.
Dry cough is more insidious. There is no point in taking expectorants. It can be caused by a variety of reasons, including microorganisms. It is necessary to treat not the cough itself, but its cause (do not bother with this, because this is the doctor's business). If it is unbearable and very frequent, there are drugs that suppress the cough nerve center. You cannot get them without a prescription. these are opioids. A dry cough does not need to be made wet. Most likely, this will happen by itself, and then take expectorants. Here it is more logical to suppress a cough or cough half-heartedly so as not to injure the mucous membrane even more. A dry cough occurs with a "cold" in the initial stages. In short, you don't have to take anything on your own with a dry cough. How to distinguish between types of cough: if you still have a significant amount of phlegm during the day (even at one time), then it is wet. Until the phlegm disappears, you need to take expectorants.
Antibiotics, antivirals for coughing (cough only) DO NOT take - and it does not matter if it is wet or dry. If a temperature appears and you are already uncomfortable, knock it down. And contact your doctor, and if he prescribes AB, then yes. Once again, you cannot take antibiotics on your own. The point is not only in safety, but in the fact that due to the uncontrolled intake of them by people, the most common microbes have long adapted to them and we have to invent new and new antibiotics. People do not know the treatment regimens, as a result, they do not cure the disease and spread the surviving and adapted bacteria everywhere.
A dry cough is caused by irritation of the respiratory tract mucosa with the onset of inflammation. That is, there was a seeding with microbes or viruses, they entered the mucous membrane, began to multiply, release toxins, die, and inflammation began. At the same time, a dry cough begins - you cough and do not hear the gurgling of sputum. Also, a dry cough does not bring relief, since the focus of inflammation does not go anywhere. The cough sound is homogeneous, without extraneous noise. If you exhale sharply with force, you will not hear gurgling. A striking example of a dry cough is when you choke on a crumb.
Further, the mucous membrane begins to vigorously excrete phlegm in order to try to wash off the microorganisms. In the cough sound, extraneous noises are added in the form of gurgling. If you exhale with force, you can clearly hear the sputum bubbles bursting, you can also hear a whistle (a sign of thick sputum). With a wet cough, there is some relief, as the phlegm moves.
With a dry, hacking cough, suppress the cough reflex. Along the way, fight inflammation (anti-inflammatory drugs, antibiotics or antiviral drugs).
With a hacking wet cough, you need to take expectorant drugs that thin the phlegm and promote its more thorough removal from the bronchi, simultaneously fighting inflammation. Can be combined with antitussives.