The video starts with quotes from several medical studies related to cough syrups and sough medicines. These studies testify that currently there are no effective syrups or medical drugs to stop coughing. But there are natural remedies for persistent cough - http://www.normalbreathing.com/c/persistent-cough-remedies.php .

Dr. Artour Rakhimov (NormalBreathing.com) explains that the best natural cough suppressants are natural chemicals that are produced in the human body: carbon dioxide and nasal nitric oxide generated in human sinuses and inhaled if we breathe through the nose.

Note that respiratory infections also worsen problems with cough. Additional factors that worsen coughing are sleep, overeating and mouth breathing. All these problems can lead to allergies and runny nose - http://www.normalbreathing.com/c/runny-nose.php - that is an obvious sign of low O2 content in vital organs and other cells of the body.

Problems with chronic coughing can appear only in people with habitual mouth breathing and too deep and heavy breathing (hyperventilation). That relates to people with COPD, asthma, cystic fibrosis and other respiratory conditions. Increase in CO2 due to slower breathing and strictly nasal breathing 24/7 are beneficial to reverse chronic cough without use of cough syrups and medicines.

Many other symptoms are similar to coughing since they also relate to overbreathing at rest. For example, cold hands and feet - http://www.normalbreathing.com/causes/cold-feet-hands-causes.php are caused by poor circulation. But reduced blood flow is due to low CO2 since CO2 is a potent dilator of arteries and arterioles. Therefore, slower breathing solves problems with cold hands of feet rather quickly.

There are several other videos about coughing that show a simple breathing exercise that can be used instead of medication to stop bouts of coughing very fast and even stop coughing at night without using syrups and other medicines.