Severe. These medicines may interact and cause very harmful effects and are usually not taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
When these two medicines are taken together, the effects of your medicines may increase.
What might happen:
Your blood pressure may decrease and cause weakness, fatigue, dizziness, loss of consciousness. You may also experience a heart attack or stroke.
What you should do about this interaction:
Contact your healthcare professionals (e.g. doctor or pharmacist) right away about taking these two medicines together. They may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.
1.Adempas (riociguat) US prescribing information. Bayer HealthCare Pharmaceuticals, Inc. October 8, 2013.
2.Revatio (sildenafil citrate) US prescribing information. Pfizer Inc. April, 2015.
3.Adcirca (tadalafil) US prescribing information. Eli Lilly and Company April, 2015.