**3. Practical outlook of herbal drug discovery**

The following facets represent outlook of the stages involved in the development of bioactive molecule as pure drug from a plant source [12].


First of all, in order to study medicinal plants, selection of plant and which type of pharmacological activity is to be studied should be clear to the researcher. Five principles of selection of plants are very important to know which are the random, the taxonomic, the phytochemical, the ethno-medical and the information-managed approach (**Figure 2**)[14].


**Figure 2.** 

*General procedure for obtaining active principles from plants.* 

