Yes, your father can. There is no any kind of side effect. Morning 4 pills × 4 days. Youn can repeat it, after 15 days.
But, note that, this medication is not a vaccine for COVID-19. It is completely false if someone says, Arsenic Alb 30, will save you from COVID-19. But, yes it can help in fast recovery, if someone gets affected with COVID-19.
Next Steps
You can buy this medication, from any Homoeopathic Medical Practitioner or from Homoeopathic Pharmacy.
Health Tips
Do not buy this medication from Non Medico Person. Now a days many peoples who have no knowledge about homoeopathic, are selling these drugs.
Thus, buy only & only from homoeopathic Practitioner.