Darkside of Medicine

When One Medicine - Leads to Another

​

Medicines can improve quality of life, control symptoms, and prevent serious illness. However, sometimes a medicine causes side effects that are mistaken for a new health condition. When this happens, another medicine may be prescribed to treat the side effect rather than addressing the original cause.

This process is known as a prescribing cascade or medicine cascade.

​

Medicine cascades can affect anyone but may become more common when people:

​

• take multiple medicines

• have complex or long-term conditions

• see multiple healthcare professionals

• develop changing symptoms over time

• experience side effects that resemble new illnesses

​​

Recognising medicine cascades is an important part of medicine safety.

​

How Does a Medicine Cascade Happen?

​

A prescribing cascade often follows a pattern:

Medicine prescribed
↓
Side effect develops
↓
Side effect mistaken for a new illness
↓
Second medicine prescribed
↓
Additional side effects may occur
↓
Treatment becomes increasingly complex

Not every new prescription is inappropriate - many people genuinely need multiple medicines. The aim is simply to make sure new symptoms are properly explored.

​

Common Examples of Medicine Cascades

​

Example 1 — Pain Relief and Stomach Protection

​

Pain medicine may irritate the stomach.

A person develops indigestion.

A second medicine is prescribed for stomach symptoms.

Over time, the original cause may become less obvious.

​

Example 2 — Medicines and Dizziness

A medicine causes dizziness or balance problems.

Symptoms may be interpreted as a separate condition.

Additional treatment is added.

The underlying medical effect may remain unnoticed.

​

Example 3 — Medicines and Fatigue

A medicine contributes to tiredness.

Reduced activity leads to muscle weakness and lower fitness.

Further symptoms develop, and more treatment is introduced.

​

Why Medicine Cascades Matter

​

Medicine cascades may contribute to:

​

• Increasing numbers of medicines

• More side effects

• Greater treatment burden

• Additional appointments and investigations

• Falls or mobility difficulties

• Reduced confidence and independence

• Difficulty identifying what is helping

​​

Over time, treatment can become harder to manage.

​

​A medicine cascade does not mean someone has been treated incorrectly.

It means healthcare can be complex.

Asking “Could this symptom be related to treatment?” is one important part of safe, person-centred care.

Listening to patients and families, reviewing medicines regularly, and considering the whole person can help reduce unnecessary treatment burden.