Both medications are generic now and can be found at discounted rates, making them more accessible to the public than ever before. For more information, you can access the full breakdown of Viagra, Viagra Connect and Kamagra. Generic versions of Viagra are also now available in the UK as sildenafil citrate. Nevertheless, each patient reacts differently to medications and there may be some degree of trial and error. Here at Pharmica, we can help you find the one that is just right for you and your lifestyle. Viagra generally only stays in your system for four to six hours. Is 20mg of Cialis better than mg of Viagra?Dosage. The dose of Cialis you need will depend on whether you’re taking it daily or as needed. Daily doses are often between and 5 milligrams (mg). The as-needed dose is usually 10 mg but can range from 5–20 mg. The typicaldose of Viagra is 50 mg. However, the dosage can range from 25– mg. AdComplete the Online Consultation with our Doctor. Personalize Your Needs. If Appropriate, Get a Prescription for ED from RexMD®. Free Shipping Available/5 (3, reviews). Kamagra has not been approved for use in the UK because it has not passed the quality control that all UK drugs undergo, therefore we do not recommend buying Kamagra tablets online. Generic sildenafil from a registered online Pharmacy is a much safer option and starts at only £ including delivery from e-Surgery.