The cause of most colds and flu are viruses. Unfortunately, prescription antibiotics do not kill viruses and taking antibiotics for the common cold does not help you get better faster. However, there are many natural treatments that can be very helpful in treating the cause and symptoms of the common cold and flu. These remedies are most effective when taken within the first few days of symptoms. If you can start taking herbs within the first 24 hours of symptoms, you will likely significantly reduce your symptoms and shorten the length of your cold.