HCQ has been around for decades worldwide with few side effects or reactions. Ivermectin has a pretty broad dosage range for efficacy. Observations have been made of people recovering from a diagnosis of Covid after a single dose of Ivermectin. Perhaps others can add more information to your quest. Other good choices include Quercitin and oral iodine when used appropriately. Quercitin has a broad range of utilitarian value. Part of the answer to your question is not so simple because it depends of the ease of access.