Sildenafil (Revatio) [for treatment of pulmonary arterial hypertension] [Clinical Comments:] A safe and effective dose has not been established when used with APTIVUS/ritonavir. There is increased potential for sildenafil-associated adverse events (which include visual disturbances, hypotension, prolonged erection, and syncope). [Drug Class] 
PDE-5 inhibitors
A l p h a 1 - a d r e n o r e c e p t o r a n t a g o n i s t
A n t i a r r h y t h m i c s
A n t i m y c o b a c t e r i a l s
E r g o t d e r i v a t i v e s
G I m o t i l i t y a g e n t
H e r b a l p r o d u c t s
H M G C o A r e d u c t a s e i n h i b i t o r s
A n t i p s y c h o t i c s
P D E - 5 i n h i b i t o r s
S e d a t i v e s / h y p n o t i c s