For example for a cold or cough, in India, traditionally tulsi or oregano has been used extensively for treatment along with honey, and it alleviates the cold/cough to a very great extent. One of the most popular cough syrups available in India uses Adulsa, a plant extract. Similarly aloe vera gel is very effective in treating scars, burns, rashes, pimples and other skin problems. There are many other plants, plant extracts which are very effective for treating ailments, without any kind of side effect, at a relatively low cost. However this information is not documented or validated.
In some cases, it is possible to use plants and herbs for medical treatment as they contain the active ingredient which are used in the medicines available in the pharmacy