Thinking of Sharing Medication? Why It’s Riskier Than You Think

It might feel harmless to share medication with a friend or family member — but in reality, it can be dangerous, even life-threatening. Prescription medicines are tailored to individual needs, conditions, and medical history. Taking medication that isn’t prescribed for you could cause serious health risks, and in the UK, it is also illegal.

Real-Life Example

One Cambridge University student found herself without her prescribed antidepressant, Venlafaxine, over a bank holiday. She turned to a private Facebook group for help. Another student offered her Prozac instead. While both are antidepressants, they work in very different ways and at different doses. Swapping between them without medical supervision could have made her severely unwell.

Why Sharing Medication Is Risky

• Incorrect dosage: Medicines come in different strengths. A dose safe for one person could be harmful to another.
• Different mechanisms: Two drugs in the same category may work differently (e.g., Venlafaxine vs. Prozac), so swapping is unsafe.
• Side-effects & reactions: Medication may interact with other medicines, over-the-counter products, or underlying conditions.
• Specific health risks: For example, some contraceptive pills increase clotting risk, while beta-blockers like Propranolol can cause breathing issues in people with asthma.

What the Research Shows

Studies suggest that up to half of adults have taken someone else’s prescription medicine, with antibiotics, painkillers, antidepressants, and contraceptives among the most common. Younger adults often do this for convenience, while older adults or those on lower incomes may do it due to cost or access issues.

But the consequences can be serious. A U.S. study found that 37% of adolescents who used another person’s prescription suffered a side-effect or allergic reaction, and over a quarter ended up needing a doctor because the medicine didn’t work.

Legal Risks

According to the Medicines and Healthcare products Regulatory Authority (MHRA), supplying prescription medicines to someone they are not intended for is breaking the law. These medicines are ‘prescription only’ for a reason — they must be prescribed after a consultation and based on clinical judgment.

The Bottom Line

Sharing medication might seem like a quick fix, but it’s unsafe and unlawful. If you’ve run out of your medicine, or you’re struggling to afford it, speak to your GP or pharmacist. They can help you find the safest solution.

Remember: Prescription medicines are prescribed for you and your specific health needs. Taking someone else’s is never worth the risk.