01What other strong CYP3A4 inhibitors consider
Other inhibitors (ketoconazole, itraconazole, saquinavir, erythromycin) only ask you to consider 25 mg. Those rows are not the 11-fold / 48-hour ritonavir cap. Saquinavir or erythromycin raised levels about three-fold.
Age, liver, and kidney sit with those inhibitors on the 25 mg start page.
02Why the cap is 25 mg in 48 hours
Not more than 25 mg in 48 hours is the recommended maximum on ritonavir. That is tighter than the usual once-per-day cap.
A late peak after dinner does not open a second 25 mg the next morning if 48 hours have not passed.
03Why a second PDE5 that night is not a fix
Stacking a second PDE5 tablet to compensate for a 25 mg cap adds another vasodilator without fixing the interaction. Stay on one sildenafil plan.
Nitrates stay contraindicated on the 25 mg stamp too.
04How 50 mg is the wrong first row on that chart
Most men without ritonavir start at 50 mg. On ritonavir the first swallow is 25 mg. Do not 'make up' the difference with a second PDE5 the same night.
Label start 50, featured 25-50 explains why this vault still names both strengths.
05What ritonavir does to sildenafil exposure
Co-administration greatly increased systemic exposure (11-fold increase in AUC). That is why the insert leaves the 50 mg start and writes a 25 mg cap.
Bring the full antiviral list to the visit. A shop carton that never asks about HIV therapy is selling a count.
06When the antiviral list has to be on the visit
Boosted regimens change. A 50 mg bottle left over from last year is not a clearance. Recheck the chart before the next swallow.
The dose-step pulse repeats the ritonavir callout. The sildenafil 25-50 mg vault keeps 25 mg in the featured band.