Cialis Black is commonly sold online through unregulated retailers and gray-market pharmacies and is not an authorized brand; regular Cialis/tadalafil is prescription-only, but some sellers or pharmacies may offer products labeled “Cialis Black” without a prescription—quality, dose and legality are highly variable.
Tadalafil (the active ingredient) is used to treat erectile dysfunction, benign prostatic hyperplasia, and pulmonary arterial hypertension (as Adcirca); it is a phosphodiesterase type 5 (PDE5) inhibitor that increases cGMP, causing smooth muscle relaxation and increased blood flow to the penis.
Usual doses for approved tadalafil: 10–20 mg as needed for ED (max once daily), 2.5–5 mg once daily for daily ED/BPH, and 40 mg once daily for PAH (Adcirca); products labeled “Cialis Black” claim much higher doses (80–200 mg) but these are unregulated and unsafe.
The drug is administered orally as a tablet (Cialis is a film-coated tablet; “Cialis Black” is sold as various tablets or packaging by unofficial sources).
Onset of action is typically 30–60 minutes before sexual activity.
Duration of action for tadalafil is long—effects may last up to 36 hours (tadalafil has a half-life around 17.5 hours), though individual response varies.
Alcohol warning: avoid excessive alcohol—combined use can increase dizziness and low blood pressure and may reduce erectile response; moderate alcohol may still increase risks when taking tadalafil.
The most common side effect is headache.
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