There have been so many studies but still nothing conclusive and I would not use it unless it is recommended by our authorities.
Ivermectin, doxycycline, zinc
There is not enough evidence to support the safe and effective use of these drugs (separately, or in combination) to prevent or treat COVID-19.
The Clinical Evidence Taskforce does not recommend the use of ivermectin, doxycycline or zinc outside of properly conducted clinical trials with appropriate ethical approval.
Hydroxychloroquine
The Clinical Evidence Taskforce strongly recommends that people do not use hydroxychloroquine to treat COVID-19.
Hydroxychloroquine has well known risks including:
https://www.health.gov.au/health-alerts/covid-19/treatments/about