The use of lichen in drug production is-
(i) Erythrin is produced from the lichen Rocella montagnei. Erythrin is used to treat angina or heart disease.
(ii) Usno and Evosin creams (antiseptics) derived from lichens are used to prevent tumors and viruses and to treat pain.
(iii) Lichenin and Isolichenin from lichens inhibit tumors.
(iv) Peltigera canina is used in rabies and Cladonia cristatella as medicine for whooping cough. Dr. Siddique Publications
(v) Medicines for jaundice, diarrhoea, fever and skin diseases are prepared from lichens.
(vi) Cetraria islandica is used as a medicine for tuberculosis.
(vii) Usonic acid produced from lichens acts as an antibiotic against gram positive bacteria.
(viii) Proteoleicesteric acid produced from lichens is used as an anti-cancer agent.
(ix) Lobaria pulmonaria lichen is used to treat lung diseases.
(x) Xanthoria is used to treat jaundice.