Erectile dysfunction can often be traced to the same causes as cardiovascular disease, including inflammation, a narrowing of the arteries, or a hardening of the arteries. Cancellation: Check if the subscription or trial period is simple to cancel if you decide not to use the service. Men can test the drug and see whether it works without committing to a full purchase with a Viagra free trial. If you have an erection that lasts more than 4 hours, get medical help right away. Data shared with Viatris will be aggregated and de-identified; it will be combined with data related to other Savings Offer redemptions and will not identify you Viatris reserves the right to rescind, revoke, or amend this Savings Offer without notice No membership fees. Remember that using your free VIagra sample responsibly ensures the best outcomes and protects your health and well-being.Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online. swelling in your hands, ankles, or feet; shortness of breath; seizure (convulsions); or. a light-headed feeling, like you might pass out. Common Viagra side effects may include: flushing (warmth, redness, or tingly feeling); headache, dizziness; abnormal vision (blurred vision, changes in color vision) runny or stuffy nose, nosebleeds;.  · The highest recommended Viagra dose for treating erectile dysfunction (ED) is mg per day, according to the drug’s manufacturer. Doses of mg or mg would be considered off-label use.