Hi, Thanks for using the HCM. I am happy to address your questions, homeopathic practitioners prescribe nat mur for colds and flu, particularly if there is a clear, runny nasal discharge that worsens in the morning, or a dry cough that develops after a period of watery chest congestion. It may also be recommended for skin complaints-- such as warts, pimples, boils, psoriasis, and excessive oiliness--for backache, and for constipation. People most likely to benefit from nat mur tend to be sensitive, inhibited, self-centered, and prone to depression and moodiness. The patients seem reserved, but can become angry when others try to comfort or sympathize, so it could be a side effect to the medication. Hope I have answered your query. If you have any further questions I will be happy to help. Thanks