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This question is somewhat ambiguous and rather broad but I will do my best to answer completely.

The two main types of effects for drugs on the CNS (Central Nervous System) is to depress it, or slow it down; or to stimulate it, or speed it up. Depressing the CNS lowers blood pressure, slows breathing and heart rate and if too severe can stop both. These will also cause drowsiness, memory loss, cognition, motivation, and possibly death. Stimulating the CNS will cause a rapid heart rate, raised blood pressure and can also affect breathing. Side effects of this are anxiety, restlessness, sleeplessness, hyperactivity, and in severe cases/overdoses can cause stroke and/or heart attack.

Some drugs do not belong in either category but still affect the CNS. These drugs are prescription medications and would have to be considered individually.

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15y ago

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