Antiviral stockpiles prepare for shortages of antiviral medications in cases of public health emergencies. Interferon alfa-2b is an antiviral or antineoplastic drug. In medicine several nucleoside analogues are used as antiviral or anticancer agents. Violacein has antibacterial, antiviral, and antifungal properties. Naproxen may have antiviral activity against influenza. Garcia believed metformin to have bacteriostatic, antiviral, antimalarial, antipyretic and analgesic actions. Hepatitis B and C may be treatable with antiviral medications. This triggers the expression of interferon-stimulated genes, which code for proteins with antiviral properties. Aciclovir is the recommended antiviral for herpes suppressive therapy during the last months of pregnancy. Chloroquine has antiviral effects against some viruses. Mechanisms of antiviral resistance vary between virus types. The first treatment in acute meningitis consists of promptly giving antibiotics and sometimes antiviral drugs. Podophyllotoxin cream is commonly prescribed as a potent topical antiviral. These include the use of chemotherapy drugs and antiviral drugs. The mechanisms for amantadine's antiviral and antiparkinsonian effects are unrelated.