Im not quite sure I follow you? Did you mean to say When? It's usually on the bottle. It's called a time pass. The doctor tells the Rph when to tell you to take it and you take it. If you mean where does it start working in the body? That depends on the drug. Some break down and assimilate in the intestine, some in the stomach, some are injectable some work in the blood stream and some are sublingual working under the tongue.

It's not a matter of the body knowing what to do with it, but what the drug/herb/whatever is and how it acts on the body. If you take some ibuprofen or something, it dulls pain anywhere - it doesn't matter if it's a headache, toothache, or sore knee. Or all 3.

Medication, taken orally (by mouth), is obsorbed into the blood stream and distributed through out the body. It then impacts the entire body, to some degree, but certain areas it impacts significantly. Laxitives effect the digestive track.

good question, one I have never thought about. So just guessing I would say that when you get a medication in your body it goes to the bloodstream and travels through the whole body, but the drug has no effects on certain parts of the body it passes through, so it's not really about the medication knowing where to go, it's that the parts of your body that need it, use it when it passes through them and those that don't need it aren't effected by that medication.

WHEN IT DISSOLVES IT DOES SO IN THE YOUR BLOOD STREAM AND IT GOES TO ALL PARTS OF YOUR BODY.

Good question.. I ask that once too! :)

Once it enters the bloodstream it can reach every cell in your body. Medications are molecules that target specific receptor molecules, like a key matched to a specific lock.

AS IT DISSOLVES IT GOES INTO YOUR BLOOD STREAM AND DEADENDS THE PAIN EVERYWHERE. I HAD A NEUCLEAR EX-RAY AT ONE TIME. ITS THE ONLY MACHINE THAT SHOWS PAIN WITHIN YOUR BODY IN TECHNICOLOR, WHETHER YOU FEEL THAT PAIN AT PRESENT OR NOT.

Different medications work different ways. All medications are absorbed into the body, however what they work on depends on what the medication is. It is a myth that all pain medications reduce all types of pain. For example, certain medications only block certain types of pain. For opioids/opiates: Before the signal reaches the pain-monitoring section of your brain, though, it goes through a receptor first. The receptor is like a radio relay station – it helps push the pain message to its final destination. Opioids attach themselves to special opioid receptors in the brain, the spinal cord, and the gastrointestinal tract. Once the opioids latch on, you’re still in pain, but you no longer feel the pain, because these pain signals have been blocked from going any farther. Complex explanation: Several major classes of opioid receptors in both the peripheral and central nervous system have been identified. These include the mu opioid receptor (typical agonist- morphine), the kappa receptor (typical agonist- butorphanol) and the delta opioid receptor. Endogenous opioids such as endorphins, enkephalins and dynorphins as well as exogenous opioids have multiple sites of action including within the peripheral nerve, the dorsal horn of the spinal cord as well as at higher levels of the central nervous system. Multiple subtypes of these opioid receptors exist and these polymorphisms may be important in ultimately understanding why some patients respond better to opioids than others as well as why some patients respond better to particular opioids and not others. With regard to other types of medication, it again depends on the med. To give you another idea, blood pressure medications are very different, and depend on the type of medication. here are the different types of blood pressure meds, and how each works: * diuretics (e.g., hydrochlorothiazide, furosemide): This class of medications works by increasing the amount of urine your body produces. This causes the body to lose salt and water, which decreases the volume of the blood, leading to lower blood pressure. * ACE inhibitors (e.g., enalapril, lisinopril, ramipril): This class of medications works by blocking the body's production of a substance that tightens the blood vessels. As a result, the blood vessels become more relaxed, and the pressure inside the vessels decreases. * beta-blockers (e.g., atenolol, metoprolol, propranolol): These medications work by slowing down the heartbeat and decreasing the strength of each beat. This means blood is pumped through the vessels with less force, which lowers blood pressure. * angiotensin II receptor blockers (e.g., candesartan, losartan, valsartan): This group of medications works in a similar way as the ACE inhibitors. But instead of blocking the production of the blood vessel-tightening substance, it stops the substance from working on the blood vessels. This causes the blood vessels to relax and the blood pressure to decrease. * calcium channel blockers (e.g., diltiazem, nifedipine, verapamil): These medications work by relaxing the tiny muscles that surround the blood vessels. When these muscles relax, the blood vessels become larger. Larger vessels means more space for the blood inside the vessels and lower blood pressure. If there is a specific type of medication you are curious about, please, ask again. Hope this answers your question! good luck!