01What headache did at 25 and 50 mg
Fixed-dose Table 1: headache 16% at 25 mg (n=312) and 21% at 50 mg (n=511) versus 7% on placebo (n=607). At 100 mg the same row was 28%.
This vault features 25-50 mg, so those two columns are the start-band read. 100% of nights do not get a headache; 16-21% did in that table.
02What climbing to 100 mg does to those percents
Headache 28% and abnormal vision 11% at 100 mg are why a flush-heavy 50 mg night is a poor reason to climb. Side effects that already dominate at 50 mg will not improve at 100.
Stay on 25 mg or 50 mg as the featured start; see the sildenafil 25-50 mg vault. Vision or hearing: stop and call is the emergency pair.
03When a flush plus a faint is a pressure talk
Flush plus lightheadedness on standing is a sit-down. Sitting pressure already dips a little after sildenafil. Nitrates remain a hard stop.
Alcohol and standing pressure is the drink page. Do not add a second 50 mg to 'push through' a faint.
04Why a flush is not proof the night worked
Flush and headache can show up whether an erection arrived or not. They are not a biomarker of success. Arousal is still required.
Blue-tinged vision is usually a transient PDE6 effect. Sudden loss of vision in one or both eyes is a stop-and-call row.
05Which effects the label lists first
Highlights name headache, flushing, dyspepsia, abnormal vision, nasal congestion, back pain, myalgia, nausea, dizziness, and rash as the common reactions at or above 2%. Headache and flush sit at the top of Table 1.
Over 3700 patients took Viagra in pre-marketing trials. Discontinuation for adverse reactions was 2.5% versus 2.3% on placebo.
06How flushing sat next to those rows
Flushing was 10% at 25 mg and 19% at 50 mg versus 2% on placebo. At 100 mg it was 18%. A red face is a labelled vasodilator effect.
Dyspepsia rose more sharply at 100 mg (17%) than at 25 mg (3%) or 50 mg (9%).