Among chemotherapy-related adverse events, drug-induced liver injury (DILI) is one of the most prevalent. In some cases, DILI is accompanied by hyperammonaemia (HA), which can disrupt chemotherapy cycles, and is associated with 25–45% mortality rates when specific antitumor agents are used. Efficacy studies in cancer patients were only found for ornithine (L-ornithine L-aspartate, LOLA) among all ammonia-lowering strategies. The amino acids in LOLA help to detoxify ammonia in the liver and other tissues, while also having several other metabolic effects. The experts expressed their viewpoints on the conducted studies, reviewed the main directions for applying LOLA in current clinical practice, and identified prospects for further research.