nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, Minitran, Deponit, Transderm-Nitro)
Isosorbidedinitrate (Dilatrate-SR, Isordil, Sorbitrate)
Isosorbidemononitrate (Imdur, ISMO, Monoket)
Recreational drugs such as amyl nitrate or nitrite ("poppers")
Drinking alcohol can increase certain side effects of Tadalafil.
Grapefruit and grapefruit juice may interact with Tadalafil. Discuss the use of grapefruit products with your doctor. Do not increase or decrease the amount of grapefruit products in your diet without first talking to your doctor.
Do not mix Tadalafil with other erectile dysfunction drugs such as sildenafil (Viagra) or vardenafil (Levitra).