Morphine

Opioids and strong painkillers

Also known as MS Contin

Morphine is the original opioid pain medicine — it works by changing how your brain and nervous system respond to pain. MS Contin is the extended-release form, taken on a fixed schedule to keep constant, severe pain under control around the clock. The honest thing to know: like all opioids, it can be habit-forming even at prescribed doses, so take it exactly as directed and keep your doctor in the loop about how it's working.

How to take it

When

Take it at the same times every day, exactly as prescribed. Swallow extended-release tablets whole — never crush, chew, or split them, because that releases a dangerous amount at once. After regular use, don't stop suddenly — your doctor will help you taper to avoid withdrawal.

Food

You can take it with or without food, but be consistent. Taking it with a little food can help if it makes you queasy.

Avoid

Never mix with alcohol, benzodiazepines (like Xanax or Klonopin), sleep medicines, or other sedatives — that combination can stop your breathing and kills. Don't drive until you know how it affects you. If you're pregnant, tell your doctor — regular use can cause a baby to be born in withdrawal.

Keep it safe

Lock it away from children and teens — a single tablet can be fatal to a child. Never share it (it's illegal and dangerous), and take leftovers to a pharmacy take-back. Ask your doctor or pharmacist about keeping naloxone (Narcan) at home — the FDA recommends it for everyone on opioids, and it's sold without a prescription.

Missed a dose?

If you miss a scheduled dose, take it as soon as you remember — unless it's nearly time for the next one, in which case skip the missed dose and get back on schedule. Never take two doses to catch up.

Common side effects

Constipation — almost everyone on morphine gets it, so start early: plenty of fluids, fiber, and ask your pharmacist about a stool softener
Drowsiness or mental fog
Nausea, especially in the first days
Dizziness or lightheadedness
Sweating or itching

Call a doctor if

Very slow, shallow, or stopped breathing, gurgling or snoring sounds, blue lips or fingertips, or someone who won't wake up — this is an overdose. Give naloxone if you have it and call 911 immediately
Extreme sleepiness or confusion, especially when starting or after a dose increase — call your doctor right away; dangerous breathing problems can follow
Hives or swelling of your face, lips, or throat — call 911 if breathing is affected
Fainting or severe dizziness that doesn't pass — get medical help
Feeling unable to control your use or running out early — tell your doctor honestly. This is a treatable medical issue, not a moral one

Educational only. This summary is drawn from public FDA labeling and MedlinePlus and simplified for readability. Your prescription label and your pharmacist always come first — doses and instructions vary from person to person.