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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

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Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.

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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

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In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.

Acromegaly in one individual from a pair of identical twins. Acromegaly in one individual from a pair of identical twins.
DNA molecules replicate to form identical chromatids DNA molecules replicate to form identical chromatids
Proportions of the genetic and physical maps are similar but not identical Proportions of the genetic and physical maps are similar but not identical
Women who are monozygotic twins and have the same genes are more similar in their marital happiness Women who are monozygotic twins and have the same genes are more similar in their marital happiness
identical (left) and fraternal (right) twins identical (left) and fraternal (right) twins
Concordance in MZ and DZ twins for a variety of behavioral disorders Concordance in MZ and DZ twins for a variety of behavioral disorders
Video: Mechanism of enzyme action

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