According to a tv ad, "because depression is a chemical imbalance, new venlafaxine's extended release can with mood, sleep, arousal, and alertness by working on the two key neurotransmitters involved in depression." the two neurotransmitters are serotonin and:

norepinephrine

Neurotransmitters are chemical messengers in the brain that are the means by which brain cells communicate with each other. New drugs like venlafaxine are called serotonin-norepinephrine reuptake inhibitors, and their function is to target two main neurotransmitters: serotonin and norepinephrine, which are the main neurotransmitters associated with depression.

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.