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The current outbreak of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) occurred in the wholesale market in Wuhan, China in the last months of 2019 and spread to almost all countries in the world. Although there is currently no specific treatment for COVID-19, certain agents are used worldwide, based on in vitro, in vivo studies, and randomized controlled trials. In this review, brief information about these drugs used for the treatment of COVID-19, the results of the conducted studies and the possible adverse effects of the drugs are summarized. We hope that this review will provide an impression of the most current therapeutic drugs used to prevent, control and treat COVID-19 patients until the approval of vaccines and specific drugs targeting SARS-CoV-2. Key Words: COVID-19, SARS CoV-2, pharmacotherapeutics

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Agomelatine is a potent agonist at melatonergic 1 and 2 (MT1 and MT2) receptors and an antagonist at serotonin-2C (5HT-2C) receptors. It was suggested that psychotropic effects of agomelatine is associated with its melatonergic and serotonergic effects. In this study, we aimed to evaluate the effects of agomelatine alone or in combination with ritanserin (5HT-2A/2C antagonist) on memory and learning. Male Balb-C mice (25–30 g) were used, and all drugs and saline were administrated by intraperitoneal (i.p.) route 30 min prior to evaluating retention time. Whilst agomelatine was administered at the doses of 1, 10 and 30 mg/kg, ritanserin was administered at the doses of 0.1, 1 and 10 mg/kg. To evaluate memory function, passive avoidance test was used. On the first day, acquisition time and on the second day (after 24h), retention time of mice were recorded. To evaluate the synergistic activity, only the least doses of agomelatine and ritanserine were used, that is, 1 and 0.1 mg/kg, respectively. Scopolamine (1 mg/kg) was used as a reference drug, so it was combined with drug groups. Our results show that 5HT-2A/2C receptor antagonist ritanserin (1 and 4 mg/kg, i.p.) and agomelatine (10 and 30 mg/kg, i.p.) improve memory deficit induced by scopolamine, whilst a synergistic interaction is observed between ritanserin and agomelatine (0.1 mg/kg and 1 mg/kg, i.p., respectively) when they were administered at their ineffective doses. According to our findings, we concluded that agomelatine improves memory deficit and thus improves the effect of agomelatine arises from its 5HT-2C receptor antagonist activity.