How the interaction occurs:
When these two medicines are taken together, your body may not process sildenafil properly.
What might happen:
Your blood levels of sildenafil may increase and cause harmful effects.
What you should do about this interaction:
Do not take more than 25 mg of sildenafil in a 48 hour period. Contact your doctor right away if you experience a painful or prolonged erection, changes in vision, or dizziness. The dose of your sildenafil may need adjusting.Your healthcare professionals (e.g. doctor or pharmacist) 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.Reference:1.Rescriptor (delavirdine mesylate) US prescribing information. Pharmacia & Upjohn Company August, 2012.