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Trypansomatids maintain their redox balance by the trypanothione-based redox system, enzymes of which exhibit differences from mammalian homologues. γ-Glutamylcysteine synthetase (Gcs) is an essential enzyme in this pathway that performs the first and rate-limiting step. l-Buthionine-(S,R)-sulfoximine (BSO), a specific inhibitor of Gcs, induces toxicity in hosts infected with Trypanosoma brucei, underlining the need for novel Gcs inhibitors. The present study reports identification of Leishmania donovani Gcs (LdGcs) inhibitors using computational approaches and their experimental validation. Analysis of inhibitor–LdGcs complexes shows modifications that could result in increased efficacy of these compounds.