updated info all footnoted... the foots are not linked here but I can get any of them. This is pulled from a much larger set of practice protocols.
Investigational agents — A number of investigational agents are being explored for antiviral treatment of COVID-19, and enrollment in clinical trials should be discussed with patients or their proxies. A registry of international clinical trials can be found on the WHO website and at clinicaltrials.gov.
Certain investigational agents have been described in observational series or are being used anecdotally based on in vitro or extrapolated evidence. It is important to acknowledge that there are no controlled data supporting the use of any of these agents, and their efficacy for COVID-19 is unknown.
●Remdesivir – Several randomized trials are underway to evaluate the efficacy of remdesivir for moderate or severe COVID-19 [95]. Remdesivir is a novel nucleotide analogue that has activity against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in vitro and related coronaviruses (including SARS and MERS-CoV) both in vitro and in animal studies [96,97]. The compassionate use of remdesivir through an investigational new drug application was described in a case report of one of the first patients with COVID-19 in the United States [98]. Any clinical impact of remdesivir on COVID-19 remains unknown.
●Chloroquine/hydroxychloroquine – Both chloroquine and hydroxychloroquine have been reported to inhibit SARS-CoV-2 in vitro, although hydroxychloroquine appears to have more potent antiviral activity [99].
Use of chloroquine is included in treatment guidelines from China's National Health Commission and was reportedly associated with reduced progression of disease and decreased duration of symptoms [100,101]. However, primary data supporting these claims have not been published [102].
Other published clinical data on either of these agents are limited. In an open-label study of 36 patients with COVID-19, use of hydroxychloroquine (200 mg three times per day for 10 days) was associated with a higher rate of undetectable SARS-CoV-2 RNA on nasopharyngeal specimens at day 6 compared with no specific treatment (70 versus 12.5 percent) [103]. In this study, the use of azithromycin in combination with hydroxychloroquine appeared to have additional benefit, but there are methodologic concerns about the control groups for the study, and the biologic basis for using azithromycin in this setting is unclear. (See "Azithromycin (systemic): Drug information".)
Despite the limited clinical data, given the relative safety of short-term use of hydroxychloroquine, the lack of known effective interventions, and the in vitro antiviral activity, some clinicians think it is reasonable to use hydroxychloroquine (or chloroquine) in hospitalized patients with severe or risk for severe infection if they are not eligible for other clinical trials. The possibility of drug toxicity (including QTc prolongation and retinal toxicity) should be considered prior to using hydroxychloroquine, particularly in individuals who may be more susceptible to these effects. Optimal dosing is uncertain; various regimens are being used, including 400 mg twice daily on day 1 then daily for five days, 400 mg twice daily on day 1 then 200 mg twice daily for four days, and 600 mg twice daily on day 1 then 400 mg daily for four days [104].
●Tocilizumab – Treatment guidelines from China's National Health Commission include the IL-6 inhibitor tocilizumab for patients with severe COVID-19 and elevated IL-6 levels; the agent is being evaluated in a clinical trial [105].
●Lopinavir-ritonavir – Lopinavir-ritonavir appears to have little to no role in the treatment of SARS-CoV-2 infection. This combined protease inhibitor, which has primarily been used for HIV infection, has in vitro activity against the SARS-CoV [106] and appears to have some activity against MERS-CoV in animal studies [107]. However, there was no difference in time to clinical improvement or mortality at 28 days in a randomized trial of 199 patients with severe COVID-19 given lopinavir-ritonavir (400/100 mg) twice daily for 14 days in addition to standard care versus those who received standard of care alone [108].
Other interventions of interest but with limited or no clinical data include interferon beta and convalescent serum.