Abstract Introduction Gender dysphoria (GD) is a mismatch of how we feel our identity, male or female, with the biological sex. This incongruity can lead to discomfort and suffering. Prejudice and discrimination may result in additional stress, with impact on quality of life (QV). Hormonal therapy (HT) is an important part of the treatment of patients with GD and can have an impact on sexual life and QV. Objective To assess the impact of HT on sexual desire and quality of life in patients with GD throughout the first 3 to 6 months of treatment. Methods Longitudinal study of quality of life (QL) and sexual desire (SD), before and 3 to 6 months after starting HT, using the WHO WHOQOL-BREF questionnaire, which assesses the physical, psychological, social and environmental domains, of DS (dyadic and solitary) through the Sexual Desire Inventory- 2 (SDI-2) questionnaire and obtaining sociodemographic, clinical and laboratory data on patients who came to our consultation with a diagnosis of GD. Results 52 patients, with a mean age of 25.11 (18–56) years, completed the WHOQOL-BREF and SDI-2 questionnaires. 30 FtM (57.7%) and 22 MtF (42.3%). Almost half 49% (n= 26) had a comorbid psychiatric disorder. In FtM the average total testosterone (TT) increased from 0.320 ng/mL to 7.190 (+/- 2.340) ng/mL and in MtF the average TT increased from 6.86 ng/mL to 0.59 (+/- 41) ng/mL 3 to 6 months after starting HT, without serious side effects. FtM showed a significant increase in DS (p < 0.01), both dyadic and solitary, while MtF showed a non-significant decrease in SD after the start of HT. There was a non-significant improvement in the physical, social relationships and environment domains and a significant improvement in the psychological domain (p < 0.01). In the physical domain, FtM patients showed a significant improvement compared to MtF patients. 20% of patients reduced or stopped psychiatric medication. Despite the negative impact of HT on SD in MtF, there was an improvement in QoL and a reduction in the need for psychiatric medication. In FtM there was a significant improvement in the psychological and physical domain. Conclusions HT is safe, improves QoL and reduces the need for psychiatric medication in patients with GD. This improvement was significant in the psychological domain. Disclosure No.