- Minerals: Liquid paraffin, magnesium sulfate, magnesium trisilicate, kaolin, etc.
- Animals: Insulin, thyroid extract, heparin and antitoxin sera, etc.
- Plants: Morphine, digoxin, atropine, castor oil, etc.
- Synthetic source: Aspirin, sulphonamides, paracetamol, zidovudine, etc.
- Micro organisms: Penicillin, streptomycin and many other antibiotics.
- Genetic engineering: Human insulin, human growth hormone etc.
Out of all the above sources, majority of the drugs currently used in therapeutics are from
synthetic source.
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