Route of administration

Injection site

Oral

Mouth

Gastric gavage

Stomach

Intravenous

Blood vessel

Intramuscular

Muscle

Epicutaneous

Intradermal

Subcutaneous

Transdermal

Skin

Transcorneal

Intraocular

Percutaneous retroorbital

Eye

Intracerebral

Brain

Epidural

Dura mater

Intrathecal

Spinal cord

Intraperitoneal

Peritoneal cavity

Intranasal

Nose

Intratracheal

Trachea

Intraosseous

Marrow cavity