Why does Cialis take at least 12-14 hours to work?

Cialis usually takes about 30 minutes to take effect with sexual stimulation and its effect lasts for up to 36 hours, which is why it is sometimes referred to as a “weekend pill”.
Talk with your doctor. You may need to try a different erectile dysfunction medication, such as Viagra, or Levitra. It is possible that a different drug will be more effective for you.

If pills do not work, other options are available. Testosterone may be prescribed by either skin patch or injection, especially if the problem is related to age. Alprostadil, injected at the penis or inserted as pellets, improves blood flow to the penis. This technique is usually more effective than medications taken by mouth.
For some patients, a vacuum pump or penile prosthesis (implant) may also be recommended or required.

Cialis (tadalafil) relaxes muscles of the blood vessels and increases blood flow to particular areas of the body. Cialis is used to treat erectile dysfunction ED and symptoms of benign prostatic hypertrophy (enlarged prostate).

Cialis is available in four different dosages of 2.5mg, 5mg, 10mg and 20mg.
20mg is the maximum dosage of Cialis, taking more will not help.

For more information visit:
https://www.drugs.com/erectile-dysfunction.html