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2. Tetrahydrobiopterin - Wikipedia

   en.wikipedia.org/wiki/Tetrahydrobiopterin

   Tetrahydrobiopterin (BH 4, THB), also known as sapropterin (), [5] [6] is a cofactor of the three aromatic amino acid hydroxylase enzymes, [7] used in the degradation of amino acid phenylalanine and in the biosynthesis of the neurotransmitters serotonin (5-hydroxytryptamine, 5-HT), melatonin, dopamine, norepinephrine (noradrenaline), epinephrine (adrenaline), and is a cofactor for the ...

3. What Happens If You Take Viagra and You Don't Need It? - AOL

   www.aol.com/happens-viagra-dont-105800158.html

   If you struggle with ED, drugs like Viagra®, sildenafil, tadalafil, and other FDA-approved medications could help with your performance. But if you’re not prescribed one of these meds, taking ...

4. Sildenafil - Wikipedia

   en.wikipedia.org/wiki/Sildenafil

   Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. [4] [8] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. [9]

5. Got Headaches from Viagra or Cialis? Here's Why & How to Treat It

   www.aol.com/got-headaches-viagra-cialis-heres...

   Try a Lower Dose of Your Medication. Clinical trials of Viagra, Cialis and other treatments for ED show that headaches tend to become more common as the prescribed dosage increases.

6. Tetrahydrobiopterin deficiency - Wikipedia

   en.wikipedia.org/wiki/Tetrahydrobiopterin_deficiency

   Tetrahydrobiopterin deficiency (THBD, BH 4 D) is a rare metabolic disorder that increases the blood levels of phenylalanine.Phenylalanine is an amino acid obtained normally through the diet, but can be harmful if excess levels build up, causing intellectual disability and other serious health problems.

7. Viagra: What It Treats & Its Side Effects ( Plus What It Was ...

   www.aol.com/lifestyle/viagra-treats-side-effects...

   Viagra has made its way into medicine cabinets the world over as a trusted medication for ED and cardiovascular health. We know intimate activity is supposed to be somewhat off the cuff, but you ...

8. Canadian International Pharmacy Association - Wikipedia

   en.wikipedia.org/wiki/Canadian_International...

   Established in 2002, the Canadian International Pharmacy Association ("CIPA") is a Canadian association of licensed pharmacy businesses offering mail order pharmacy services to Canadian and international patients. CIPA members sell pharmaceuticals and maintenance medications to individuals upon receipt of a valid prescription.

9. How Much Viagra Is Too Much? - AOL

   www.aol.com/much-viagra-too-much-105700581.html

   Viagra or sildenafil, the active ingredient and generic version, is a PDE-5 inhibitor that widens blood vessels inside the member to allow better blood flow for stronger or longer-lasting arousal.