Viagra (Sildenafil Citrate) 100mg x16 Genuine Pfizer product. Manufactured by Pfizer, VIAGRA is indicated for the treatment of erectile dysfunction (impotence). For most patients, the recommended dose is 50 mg taken, as needed, approximately 1 hour before sexual activity. However, VIAGRA may be taken anywhere from 4 hours to 0.5 hour before sexual activity. Based on effectiveness and toleration, the dose may be increased to a maximum recommended dose of 100 mg or decreased to 25 mg. The maximum recommended dosing frequency is once per day. Viagra must NEVER be taken in combination with NITRATE-based drugs including Amyl-Nitrates.) Click here for list of nitrate-based meds. For more information: Information for consumers: http://viagra.com/ Our Clinical Information page: www.directresponsemarketing.com/viagra-info.html You are advised to read the product label together with any information enclosed in the packaging each time before using this product.