Tadalafil Reference

Plain English

What it is

Tadalafil is a prescription pill in the PDE5 inhibitor family. Sold as Cialis, it treats erection problems and an enlarged prostate; sold as Adcirca, it treats a kind of high blood pressure in the lungs. People call it the 'weekend pill' because it stays active in the body for a long time.

What people use it for

Doctors prescribe it to help men get and keep an erection, to ease urinary symptoms from an enlarged prostate, and (as Adcirca) to help people with lung-artery high blood pressure exercise more easily. In the biohacker world, some people take small daily amounts hoping for better blood flow or better 'pumps', which is an off-label use.

What the science shows

It works by relaxing the smooth muscle in blood vessels so blood can flow more easily where it is needed. Large human studies support its approved uses for erections, prostate symptoms, and lung blood pressure. Its long-lasting action is what sets it apart from shorter-acting options.

The catch

It is a real drug with real risks. Mixing it with nitrate heart medicines can crash your blood pressure to dangerous levels, and combining it with some blood-pressure or prostate drugs or a lot of alcohol can make you faint. Rare but serious harms include an erection that will not go down, sudden vision loss, and sudden hearing loss. It needs a prescription, and the daily low-dose blood-flow trend is off-label and not studied for that purpose.

Reference summary

Long-acting oral PDE5 inhibitor with strong human evidence for its labeled uses. Randomized trials support erectile dysfunction (as-needed and once-a-day) and BPH/LUTS, where 5 mg daily improves IPSS symptom scores versus placebo, and Adcirca (40 mg daily) improves exercise ability in PAH. Mechanism is well established: it blocks PDE5, raising cGMP in the nitric-oxide pathway and relaxing vascular and lower-urinary-tract smooth muscle. Its long half-life (about 17.5 hours) is the basis of the weekend-pill nickname. Off-label microdosing for general blood-flow goals is not supported by dedicated trials.

Regulatory and posture

Categories

Sexual Health

Aliases

Cialis, Adcirca, Alyq, Tadliq, generic tadalafil, IC351, weekend pill

Evidence posture

human - Labeled uses (ED, BPH, PAH) are backed by large human trials; the daily low-dose blood-flow or pump use is off-label and not FDA-evaluated.

Regulatory status

FDA-approved prescription medicine. As Cialis it is approved for erectile dysfunction (initial U.S. approval 2003), for once-a-day ED use (2008), and for the signs and symptoms of benign prostatic hyperplasia (BPH) with or without ED (2011). As Adcirca it is approved for pulmonary arterial hypertension (PAH). The daily low-dose general blood-flow or pump use popular with biohackers is off-label and has not been evaluated by FDA.

Content review status

label verified