Rheunac is a very safe drug. The main reported side effects are mild, and should clear up quickly. As with all medications, if any unusual effects are noticed that persist or worsen, report them to your healthcare provider or pharmacist immediately.

The main side effects in breathing that have been noted include additional mucus, sore throat, tight chest or a runny nose. Other general conditions can be stomatitis (painful swelling or sores on the inside of the mouth), drowsiness, fever, nausea and vomiting, or clammy skin.

There have been very rare reports of more serious reactions, such as an outbreak of hives, or trouble with breathing or coughing up blood. If any of these are noticed, stop taking the medication immediately and go straight to your healthcare provider.

The main need for Rheunac is in patients with Chronic Obstructive Pulmonary Disease (COPD). COPD can be caused by infections (by viruses such as rhinoviruses, influenza and Covid-19 or by bacteria), or chronic conditions resulting from smoking or long-term exposure to toxins or small particles. These cause a buildup of thick and sticky mucus in the airways, creating difficulties in breathing. 

Rheunac works to soften any mucus deposited in the airways, making it easier to cough out. It also promotes the production of antioxidants to help maintain the health of the liver. The benefits of this include quicker recovery from heavy muscle exertion, improvements in cognitive function and relief of depression.