• Oral (oi)
• Intraperitoneal (ip)
• Subcutaneous (sc)
• Intramuscular (im)
• Intravenous (iv)
• Intracerebellar ventricular (icv)

Due to the nature of the disease or the chemical properties of the therapeutics, various routes of drug administration may need to be examined. For example, for a drug with a shorter half-life, repeated drug administration may be needed, but an invasive method may not be appropriate as it may cause damage.