Famotidine can make it harder for your body to absorb other medicines you take by mouth. Tell your doctor if you are taking:
cefditoren;
dasatinib;
delavirdine;
fosamprenavir; or
tizanidine (if you are taking famotidine liquid).
This list is not complete. Other drugs may interact with famotidine, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.
 Pepcid drug interactions (more detail)
