Lichens as a potential source of bioactive secondary metabolites -- Lichens used in traditional medicine -- Lichen secondary metabolites as potential antibiotic agents -- Studies on antioxidant properties of lichen secondary metabolites -- Investigations of lichen secondary metabolites with potential anticancer activity -- Antigenotoxic effect of some lichen metabolites -- Lichen secondary metabolites as possible antiviral agents -- Future directions in the study of pharmaceutical potential of lichens.