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Viagra:
Viagra is a drug for erectile dysfunction and is taken in pill form by mouth. It is an inhibitor of cyclic-guanosine-monophosphate PDE5.
Besides the adverse effects listed above Viagra has bad reactions with many drugs.
What drugs are known to react with Viagra?
•Do not take Viagra if nitrates are also being used. These nitrates include:
• Tell your doctor if you are taking any of the following:
Viagra is a potent drug and you must inform your doctor prior to any changes in medication and in addition to taking or stopping any non-prescription drugs and formulas.
Cialis:
Cialis(tadalafil) is also an inhibitor (cGMP) (PDE5) and used to treat erectile dysfunction as well.
Known drug interactions with Cialis include:
*Source, drugs.com

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