Intrathecal injection – This injection is made into the sheath of membranes (meninges) which surround the spinal cord and brain. The effects of the drug so administered are usually limited to the central nervous system and intrathecal injections are often used to produce anesthesia.
Intracavitary Injection – This injection is made into the body cavity, as, for example, into the peritoneal or pleural cavity.
Inhalation - In this method of administration, vapours or gases are taken into the nose or mouth and are absorbed into the bloodstream through the thin walls of the air sacs in the lungs. Aerosols (particles of the drug suspended in air) are administered by inhalation.
Idiosyncrasy. In some instances, a patient may display unexpected effects following the administration of a drug. Idiosyncratic reactions are produced in very few patients taking a drug, but may be life-threatening in those few instances. For example, in some individuals penicillin is known to cause an idiosyncratic reaction such as anaphylaxis (acute type of hypersensitivity, including asthma and shock).
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