Let's take a minute to talk about your medication. 

This is a morphine injection. It is a very effective pain reliever. When morphine is given as a shot under your skin, the dose starts working in 10 to 30 minutes. When it is given into your vein, or 'IV', the dose starts working in just a few minutes. 

Some side effects can occur. You could feel drowsy, so wait until you know how it affects you before doing activities that require you to be alert. You might feel dizzy. To help reduce this, you should stand up slowly after sitting or lying down. You could develop constipation.  You can ask your doctor if you should take a laxative to prevent or treat constipation. Morphine can also cause nausea, sweating and itching. If these or other side effects make you want to stop taking morphine, please talk to your doctor or pharmacist. 

After regular use, morphine can become habit-forming. So, don't suddenly stop taking it unless your doctor says it's okay. 

Morphine can interact with other medicines. You should tell your doctor and pharmacist all of the medicines you take. Also, you should avoid drinking alcohol.

As with any medicine, rare but more serious side effects can occur. You should tell your doctor if you notice any unusual changes to your body. This includes extreme sleepiness, stomach pain or decreased breathing. 

Morphine can be unsafe to others. If you have doses at home, store them securely. Also, discard any unused doses promptly. Your pharmacist can advise you on the best way to dispose of them in your area. 

For best results, work with your doctor to find the lowest dose that works best for you.