I’ve been taking Viagra from this trusted pharmacy - viteron.com/viagra for a long time the normal way (oral), and it works well and predictably for me. Snorting it is honestly a bad idea in my opinion: it can burn the nose badly, irritate the sinuses, and the absorption/dosing is unreliable, with more side effects like headache or heart racing and no real benefit.
Stick to the prescribed oral use on an empty stomach if you want faster onset, or talk to a doctor about dose or alternatives—don’t mess with your nose for something that already works safely when taken as intended.