Demerol is usually injecting into the vein, muscle, or under the skin. It should only be used as directed by your doctor. 

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The Dilaudid IV is typically injected once every 2 to 3 hours as needed.

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That depends on the type of codeine consumed. For instance, codeine injections provide instant relief from pain. Codeine tablets, liquid syrup, and cough syrup, on the other hand, take around 30 to 60 minutes to work and wear off after a few hours.

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Codeine is best when taken at the lowest effective dose for the shortest duration of time. This dose can be taken for up to 4 times a day at intervals of 6 hours. The maximum daily dose should not surpass 240 mg in any way. For adults, this ideal dose should be around 30-60 mg every four hours to a maximum daily dosage of 240 mg.

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Codeine can be spotted in urine for up to 48 hours after the last drug dose. However, it can be detectable in chronic users for up to 1 week. It can also be detected in saliva for up to 21 hours after the last dose and in hair follicle tests for up to 10 weeks.

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Long-term effects of codeine misuse or addiction are insomnia, nightmares, and liver damage. Therefore it is recommended to be taken only as prescribed by a medical professional. 

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Most of the drugs are dated to expire after one to five years, but the time frame does not necessarily correspond to the potency of the drug.

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Codeine operates in the central nervous system and the brain by blocking pain signals in the body. 

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Although many people consume alcohol as a casual pick-me-up or to make them feel better, it is worth noting that it is a central nervous system depressant. As such, similar to other depressants, alcohol also impairs and slows down both physical and psychological activity.

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Depression of the central nervous system is a physiological condition that can result in decreased breathing rates, weakened heart rate, and loss of consciousness that may lead to coma or death. It is the ultimate result of inhibited or suppressed brain activity.

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