The generic versions are just as effective and much less expensive. Tadalafil is its active ingredient and is available as a generic drug. This is important for your overall health and safety, as certain medications can negatively interact with each other or cause existing conditions to worsen. Shipping: Discreet, fast shipping is a must. For this purpose, one dose works for up to 72 hours.Tadalafil (Cialis) is taken by mouth either as needed before sexual activity or once daily for erectile dysfunction (ED).It’s also taken once daily to treat symptoms from an enlarged prostate (benign prostatic hyperplasia, or BPH).Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include . Dosage: 5 mg. Usage: take as needed or daily at a low dosage. GET STARTED WITH HIMS. MNT ‘s review. At Hims, Cialis is available as: Daily tadalafil: or 5 mg daily pill. Tadalafil: 5 mg, Side Effects. Headache, stomach upset, back pain, muscle pain, stuffy nose, flushing, or dizziness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To.