01Does 10 mg start an erection without stimulation?
No. The US Cialis label still requires sexual stimulation. Tadalafil does not create an erection in the absence of that signal.
Men who swallow 10 mg and wait on the couch for an automatic start are waiting for a row the insert does not write.
02If stimulation was there and 10 mg still felt thin, what next?
A clean miss with arousal present, limited alcohol, and a couple of hours of lead is a 20 mg talk with the writer. Two rushed tries after wine are not that miss. See 10 mg then 20 or 5.
Do not add a second PDE5 the same night as a backup switch.
03Does a daily 5 mg trough skip the need for stimulation?
Daily 2.5 or 5 mg still needs stimulation when sex happens. The trough is untimed exposure, not an automatic erection on Tuesday morning.
That daily bottle is not this vault's 10 mg PRN. See daily versus 10 mg PRN.
04What does stimulation have to supply?
Penile erection during sexual stimulation is caused by increased penile blood flow after relaxation of smooth muscle. Nitric oxide is part of that local cascade. Tadalafil inhibits PDE5 so that cGMP signal can last. Without the first signal, the tablet has nothing to hold.
This page will not retell the full cascade. The job is the missing stimulation, not a textbook.
05Does the long tail mean I stay erect?
Half-life near 17.5 hours keeps tissue exposure around. Men describe easier second attempts, not a locked erection. A four-hour erection is emergency care. See erection past four hours.
The timed 24-hour read sits on the 483-man program.
06If the peak is at two hours, why is nothing happening?
Peak plasma near two hours is chemistry. Rigidity still needs a willing partner, sleep, and the local signal. A high plasma number with no stimulation is an unused tablet.
Food does not hold the swallow. Alcohol can steal the attempt. Those are other probes.