About 71 percent of the Earth's surface is water-covered, and the oceans hold about 96.5 percent of all Earth's water. Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog. Water is never sitting still. If all of the world's water was poured on the contiguous United States, it would cover the land to a depth of about 107 miles (145 kilometers). 2  Of the freshwater on Earth, much more is stored in the ground than is available in lakes and rivers.
If you happen to take too much Namenda, overdose symptoms may include drowsiness, changes in heart rhythm, vomiting, and unconsciousness. NamendaÂ® (memantine hydrochloride) is a prescription medication used to treat Alzheimer's disease. It belongs to a group of medications known as NMDA receptor antagonists.
More frequent side effects include: headache, hypertension, and constipation. See below for a comprehensive list of adverse effects. For the Consumer. As well as its needed effects, memantine (the active ingredient contained in Namenda) may cause unwanted side effects that require medical attention. If any of the following side effects occur while taking memantine, check with your doctor immediately: