In severe cases of infection, such as colds of long duration, pneumonia, or AIDS, several remedies are often combined: one for cough along with one for fever, and an antibiotic. You might take all three of these several times daily. The dosage will vary according to your symptoms. Do not be afraid to take more than the dosage recommended on the bottle. You know the herbs have done their job when your phlegm turns from green or yellow to thin white. Then continue taking the herbs for another couple of days to knock out any remaining infection.