Tiny sample, but not exactly "anecdotal".
https://www.deseret.com/u-s-world/2020/3/18/21183917/coronavirus-covid19-france-drug-trial-professor
Professor Didier Raoult, who works for the infection hospital l’Institut Hospitalo-Universitaire (IHU) Méditerranée Infection in Marseille, published a new video in which he explained that the COVID-19 patients who were treated “with the drug chloroquine had seen a rapid and effective speeding up of their healing process, and a sharp decrease in the amount of time they remained contagious,” according to The Connexion, an English site for French news.
Chloroquine has previously been used to prevent and treat malaria.
The drug was offered to 24 patients, who were among the first 24 to become infected in France’s southeastern region.
Patients were given the drug for 10 days. Researchers monitored the patients since the drug can cause severe side effects.
Raoult said those who did not receive the drug were still contagious after six days. Those who tried the drug were only 25% contagious, though.