The present invention is concerned with deuterium-enriched pyrimidine compounds of formula I, their derivatives, enantiomers, diastereomers, solvates and pharmaceutical salts thereof,and their uses in the treatment, prevention and modulation of various diseases including chronic liver diseases, liver cirrhosis, liver fibrosis, hepatocellular carcinoma, liver cancer, renal cell carcinoma, kidney cancer, colorectal cancer, brain cancer, breast cancer, blood cancer, lung cancer, thyroid cancer, ovarian cancer, pancreas cancer, prostate cancer, stomach cancer, testicular cancer, uterus cancer, intestinal cancer, skin cancer, and other forms of cancer, carcinoid tumors, teratocarcinoma, tumor progression, metastasis and fibrosis in the neuroendocrine neoplasia, fibrotic processes as well as a disease state modulated directly or indirectly with 5-HT receptors, 5-HT1, 5-HT1A, 5-HT2 receptors, 5-HT2A and 5-HT2B receptors, dopamine receptors and multiple kinase pathways.