If nitrates have been prescribed to you in the past, whether you took them or not, be sure to tell your doctor. Splitting all the pills in the packing can lead to their deterioration due to exposure to moisture or heat. Consult your pharmacist or local waste disposal company. Selected from data included with permission and copyright by First DataBank, Inc. Your doctor will be able to determine the dose that will best suit you.How to properly place an order online with Quickly and easily steps to get your medication from a Canadian Pharmacy Online. Need Help? Chat Online or Toll Free: 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 in quantities of 8 tablets, which will be 2 blisters pack of 4 pills. The generic form of Viagra (Sildenafil) is available in dosage forms of 25 mg, 50 mg and mg. Buying prescription drugs online is easy with Canada Pharmacy. All you need to do is search for.