For people suffering from diptheria, one of the best remedies may be a combination of castor leaves, drumstick leaves, and garlic. When these are ground together into a paste, they release certain aromatic compounds that can be antibacterial and immune-boosting in nature, similar to aromatherapy. Also, for a more direct and powerful approach, mix this paste with water and gargle with it. This can eliminate the membrane formation in the throat and neutralize the infection.