| Sildenafil, tadalafil, vardenafil | |
| Anaphylaxis with 1st dose, seizures with accumuation, pregnancy category B, false urinary glucose test, uricosuric agents can increase beta-lactam levels, time dependent killing | |
| SSRIs, SNRIs, TCAs | |
| Decreased salt intake, NSAIDS, ACE-I, ARBs, dehydration |