Mullein (Verbascum thapsus) is used as a natural remedy for asthma, other respiratory disorders, ear infections, cough, and sore throat.
There are not many known side effects of mullein, although some people may experience an allergic reaction to the plant. If an allergic reaction occurs, the symptoms usually include itchiness on the hands, arms, and neck.
In rare cases, there may be breathing problems or a feeling of tightness in the chest and throat. If any negative side effects occur, stop taking the supplement and consult with your doctor.
Mullein should not be used if you are pregnant or nursing.
Always talk with your doctor before taking any supplement, whether it be natural or not. Sometimes, negative interactions can occur between other supplements or medications, so your doctor will be able to advise you on the medications and supplements that you are taking.