Administering medication using the correct route

Medicines are administered by various routes either directly into or onto the body 

Two main factors determine whether or not a drug will reach its intended site of action in the body:

  • The bioavailability of the drug;
  • How the drug is given (route of administration).

Let's consider the routes:

  • Oral
  • Sublingual
  • Rectal
  • Topical
  • Parenteral – Intravenous, intramuscular, subcutaneous




It's also used for other types of long-standing pain when weMorphine is a strong painkiller. It's used to treat severe pain, for example after an operation or a serious injury, or pain from cancer or heart aker painkillers no longer work.

Key facts

-Morphine works by blocking pain signals from travelling along the nerves to the brain.

-The most common side effects of morphine are constipation, feeling sick and sleepiness.

-It's possible to become addicted to morphine, but this is rare if you're taking it to relieve pain and your doctor is reviewing your treatment regularly.

Classifying Pain

Pain can be classified according to severity and duration - the article explores 4 keys types of pain

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