Abstract
Objective Even mild hypothyroidism in pre-menopausal women is accompanied by impaired sexual functioning. The study was aimed at comparing the effect of levothyroxine, administered alone or in combination with liothyronine, on sexual function and depressive symptoms in pre-menopausal women treated because of hypothyroidism.Methods This quasi-randomized, single-blind study included 39 young women receiving levothyroxine treatment who, despite thyrotropin and thyroid hormone levels within normal limits, still experienced clinical symptoms of hypothyroidism. These patients were divided into two groups: group A (n = 20) continued levothyroxine treatment, while group B (n = 19) received levothyroxine/liothyronine combination therapy. At the beginning of the study, and 6 months later, all participants of the study filled in questionnaires evaluating female sexual functioning (Female Sexual Function Index; FSFI) and the presence and severity of depressive symptoms (Beck Depression Inventory-Second Edition; BDI-II).Results The study was completed by 37 women. Baseline sexual functioning and depressive symptoms did not differ between the study groups. Neither the total FSFI score nor the domain scores changed throughout the study in women who continued levothyroxine treatment. Compared to levothyroxine administered alone, levothyroxine/liothyronine combination therapy increased scores for two domains: sexual desire and arousal, tended to increase the total FSFI score, as well as tended to decrease the overall BDI-II score. The effect of the combination therapy on sexual function correlated with a treatment-induced increase in serum levels of free triiodothyronine and testosterone.Conclusions The obtained results suggest that levothyroxine administered together with liothyronine is superior to levothyroxine administered alone in affecting female sexual functioning.
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