In the elliptical orbit, the center of mass of the orbiting-orbited system is at one focus of both orbits, with nothing present at the other focus. As a planet approaches periapsis, the planet will increase in speed, or velocity.
Drugs that cause hyponatremia include: 1  Diuretics: Thiazides, bumetanide, indapamide, ethacrynic acid, furosemide. 2  Antidepressants: Selective serotonin reuptake inhibitors, tricyclic antidepressants (amitriptyline, protriptyline, desipramine), monoamine oxidase inhibitors, venlafaxine.
Thiazide diuretics (sometimes called water pills) are a common cause of hyponatremia. These drugs increase sodium excretion, which increases water excretion. Thiazide diuretics are usually well-tolerated but can cause hyponatremia in people prone to low sodium, particularly the elderly.