- 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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