What are some H2 receptor antagonists and their nursing implication?

1)Cimetidine(Tagamet)- Increases serum levels and clinical effects of oral anticoagulants, theophylin, phenytoin, some benzodiazepines and propanolol(These drugs may require dosage reduction) 2)Famotidine(Pepcid)-Does not affect serum levels of hepatically metabolized drugs 3)Nizatidine(Axid)- Does not affect serum levels of hepatically metabolized drugs 4)Ranitidine(Zantac)- Minimal effect on serum levels of hepatically metabolized drugs