A Received An Unopened Bottle Of Slidenafil Citrate Capsule Form

A received an unopened bottle of slidenafil citrate capsule form 25 mg from a cousin ( her husband's - who passed away recently). My question is : is this a generic form of Viagra. It came from a company by the name of MJR. Is it safe for me to take? I have taken 50 & 100 msg of Viagra before. I have been diagnosed with Ed. I am 64 years old with no history of heart problems. I also received an unopened bottle of Tadalafil/Sildenafil . Is this product ok to use. Thank you, Dan