Terpenic composition for use as antimicroorganism or antiviral agent, comprises a cyclic terpenic compound obtained from terpene compound and an organic substance forming carrier, associated with cyclic terpenic compound. Terpenic composition for use as antimicroorganism or antiviral agent, comprises a cyclic terpenic compound obtained from terpene compound of formula (C 5H 8) n and an organic substance forming carrier, associated with cyclic terpenic compound. n : 2-5. An independent claim is included for the preparation of the terpenic composition comprising combining an organic substance forming carrier with the cyclic terpenic compound. ACTIVITY : Virucide; Antimicrobial. MECHANISM OF ACTION : None given.