However, all prescription deliveries are at the discretion of the pharmacist. If chest pains, dizziness, or nausea are experienced during sex, the exertion should be stopped and your doctor informed. Blood pressure may suddenly drop to life-threatening levels if Viagra Sildenafil is taken with any nitrate-containing medication e. Depending on your specific circumstances, your doctor may want you to: stop taking one of the medications, change one of the medications to another, change how you are taking one or both of the medications, or leave everything as is. Sexually transmitted infections: Viagra Sildenafil does not protect against sexually transmitted infections such as HIV. If Viagra is taken with alpha blockers, your blood pressure can drop suddenly making you feel dizzy and faint. You can find your pharmacy’s contact details below!If you’re interested in buying Viagra online, five of the best options available are Hims, Roman, Lemonaid, Optum Store, and REX MD. Read on for full details on the process . Free delivery to your door. Delivery is free! We deliver next business day to most areas across Ontario, and in business days to Manitoba, Nova Scotia, and New Brunswick. . The medication Viagra is manufactured by Pfizer Canada Inc and it comes in 25 mg, 50 mg and mg dosage forms in a blister pack of 4 tablets. We are supplying brand Viagra .