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B1 Chapter 3- Medicine And Drugs (Drugs (Recreational drugs (Heroin and…
B1 Chapter 3- Medicine And Drugs
Developing New Medicines
Substances tested to see if they cure disease or relieve symptoms
First tests
Cells , tissues or organs
Second Tests
Animals , humans
Patients
Placebos used
Does not contain drug
Tested to see if drug has effect
Double blind trial- doctor nor patient knows who is given drug
Low doses to see if its safe
Thalidomide
Developed as sleeping pill
Control sickness for pregnant women
Not tested for use in pregnancy
Caused deformity in babies
Drug banned rules for testing improved
Been used to treat other conditions eg leprosy
How Effective Are Medicines
Statins
Lower amount of bad cholesterol
Given to older people
Trials show reduced heart disease and strokes
Herbs
Some prefer drugs not prescribed by doctors
St Johns Wort taken to treat depression
Need double blind trials to see if herb is better than Prozac
Drugs
Useful drugs
Made from natural substances
Used by indigenous people
Test over long time
Make sure no serious side effects
Recreational drugs
Used for pleasure
Heroin and cocaine
Very addictive, illegal
Cannabis
Illegal, can lead to using harder drugs
Stop taking addictive drugs- withdrawal symptoms
Legal And Illegal Drugs
Medicinal drugs
Developed over many years
Used to control disease or help suffering
Most only available by prescription
Recreational drugs
Used for pleasure
Affect brain and nervous system
Adverse effects on heart and circulatory system
Affect nervous system-easy to become addicted
Nicotine and alcohol-legal drugs
Many health problems with legal drugs
Some drugs used for medicinal purposes can be used illegally- stimulants for sports