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2. Tadalafil - Wikipedia

   en.wikipedia.org/wiki/Tadalafil

   Tadalafil is an annulated 2,5-diketopiperazine. [25] It is also a 1,2,3,4-tetrahydro-β-carboline. Tadalafil can be synthesized starting from (D)-tryptophan methyl ester and piperonal via a Pictet–Spengler reaction. This is followed by condensations with chloroacetyl chloride and methylamine to complete the diketopiperazine ring: [26]

3. Cialis Side Effects: What to Expect (& How to Avoid Them) - AOL

   www.aol.com/cialis-side-effects-expect-avoid...

   Remember, tadalafil 5-milligram side effects tend to be less severe than those experienced with 10- or 20-milligram dosages. Your provider may recommend adjusting your Cialis dosage if you’re ...

4. Tadalafil: Your Ultimate Guide to Dosages, Side Effects & More

   www.aol.com/tadalafil-ultimate-guide-dosages...

   Tadalafil is available in several dosages, from a minimum dosage of 2.5mg (milligrams) all the way up to a 20mg per tablet, the maximum dose of tadalafil in 24 hours. Tadalafil 10mg: Typical ...

5. Is It Safe to Take Cialis Daily? - AOL

   www.aol.com/safe-cialis-daily-115900442.html

   Unlike other ED medications, such as Viagra® (sildenafil) and Levitra® (vardenafil), which work for four to five hours per dose, Cialis® (which contains the active ingredient tadalafil) is a ...

6. Vardenafil - Wikipedia

   en.wikipedia.org/wiki/Vardenafil

   Vardenafil's indications and contraindications are the same as with other PDE5 inhibitors; it is closely related in function to sildenafil citrate (Viagra) and tadalafil (Cialis). The difference between the vardenafil molecule and sildenafil citrate is a nitrogen atom's position and the change of sildenafil's piperazine ring methyl group to an ...

7. Macitentan/tadalafil - Wikipedia

   en.wikipedia.org/wiki/Macitentan/tadalafil

   Macitentan/tadalafil, sold under the brand name Opsynvi, is a fixed dose combination medication used for the treatment of pulmonary arterial hypertension. [2] It contains macitentan , an endothelin receptor antagonist (ERA); and tadalafil , a phosphodiesterase 5 (PDE5) inhibitor .

8. Your ED Pill Guide: Everything You Need to Know Before ... - AOL

   www.aol.com/ed-pill-guide-everything-know...

   Sildenafil (Viagra), tadalafil (Cialis) and vardenafil (Levitra) typically start working within 30 to 60 minutes, while avanafil (Stendra) works within 15 to 30 minutes. As with most prescription ...

9. Schedule H - Wikipedia

   en.wikipedia.org/wiki/Schedule_H

   Schedule H is a class of prescription drugs in India appearing as an appendix to the Drugs and Cosmetics Rules, 1945 introduced in 1945. These are drugs which cannot be purchased over the counter without the prescription of a qualified doctor.