Cimetidine – Over the counter drug approved by the FDA. It has been shown to enhance the immune system. It is also beneficial for combatting various infections and is also used to treat herpes simplex infections. It could increase the risk of a cytokine storm, and should be avoided by people who are at risk for this.Statin class drugs –Reduce serum lipids like cholesterol, and is used to treat and prevent vascular disease. It can also help to regulate inflammatory responses to some influenza viruses.