Learn more on how the body absorbs and uses medicine: http://www.merckmanuals.com/home/drugs/administration-and-kinetics-of-drugs/drug-absorption
How rapidly drugs are absorbed into the body depends on factors such as the speed of the gastrointestinal tract, how acidic it is, and whether the drug is designed to be absorbed slowly (called slow- or sustained-release preparations). Drugs come in tablets, capsules, skin (transdermal) patches, suppositories, and liquids (solutions). Drugs are transformed (metabolized) in the body by enzymes such as those in the liver or kidneys. Drugs that are inactive when taken, but become active after being metabolized, are called pro-drugs. Drugs are eliminated from the body in the urine (for example, if they are soluble in water or after being metabolized) or feces.
About The Merck Manuals:
First published in 1899 as a small reference book for physicians and pharmacists, The Merck Manual grew in size and scope to become one of the world's most widely used comprehensive medical resources for professionals and consumers. As The Manual evolved, it continually expanded the reach and depth of its offerings to reflect the mission of providing the best medical information to a wide cross-section of users, including medical professionals and students, veterinarians and veterinary students, and consumers.
• Merck Manual Consumer Version: http://www.MerckManuals.com/Home
• Facebook for Consumers: http://www.Facebook.com/MerckManualHome
• Twitter for Consumers: http://www.Twitter.com/MerckManualHome
Take between 30 and 60 minutes (and up to 4 hours) before sex; works for about 4 hoursRecommended dose for most men is 50mgs; after that, dosage may go to as high as 100mg, or as low as 25mg, which may be prescribed for men over 65.Quickly absorbed by the body, less effective after a high-fat meal, and best taken on an empty stomach. Erectile Dysfunction Drugs Comparison Chart Compare Viagra, Cialis, Levitra
Take 1 hour before sex; works for 4 to 5 hours, and may be slightly more effective than ViagraStarting dose for most men is 10mgs a day, but men over 65 often start on the 5mg pill.Can be taken with or without food, although slightly less effective after a high-fat meal. Avoid anything containing grapefruit juice; it may make side effects worse. Cialis New Viagra for femalesAchat Cialis sans ordonnanceWhat if a woman took CialisGeneric Cialis cheapest priceBuy Viagra for cheapHow does Viagra worksViagra delivery UKCialis works goodFree Viagra order online Comes in two forms. The daily pill stays effective in between doses, but may take 4 to 5 days before it begins working. The “weekender” version of Cialis can start working in as little as 30 minutes for men who take the highest dose of the drug (20mgs); it stays effective in the body for up for 36 hours.Daily pill comes in both a 2.5mg and 5mg tablet; most men start with the lower dose. The use-as-needed, “weekender” pill comes in 5, 10 and 20mg strengths; recommended starting dose is 10mg,Can be taken with or without food. Avoid heavy drinking (5 glasses of wine or 5 shots of whiskey); when combined with Cialis, it can lead to headaches, dizziness, an increase in heart rate, and a drop in blood pressure.