A pharmacist has warned that common medications could be contributing to a rise in Victorian diseases such as scurvy, shingles and rickets. Millions of Britons take prescription drugs for conditions including arthritis, diabetes and thyroid problems. But Peter Thnoia, a pharmacist at online service PillTime, said patients should be aware that some combinations can contribute to vitamin deficiencies.

For example, diuretics used to treat conditions where the body retains excess fluid, including high blood pressure, can cause low potassium. Mr Thnoia said: “Low potassium can lead to muscle weakness, cramps, fatigue, and even heart rhythm disturbances if left unchecked.

“Whilst eating a diet of potassium-rich foods like bananas, avocados and sweet potatoes will help to combat some of the lost levels, anyone taking diuretics should have their nutrient levels monitored regularly, as this can make a real difference in spotting early signs.”

Corticosteroids are a class of steroid hormones widely used to manage conditions such as asthma, rheumatoid arthritis and inflammatory bowel disease.

Mr Thnoia said they are highly effective at reducing inflammation, but “long-term use can reduce calcium absorption and increase calcium excretion”.

He added: “This puts patients at a higher risk of weakened bones, osteoporosis, and fractures, especially as they age.

“If you’re taking corticosteroids regularly, it’s important to monitor your bone health and consider calcium and vitamin D supplementation where appropriate.”

Other examples include diabetes medications like SGLT2 inhibitors, which are used to manage blood sugar but can lead to reduced absorption of water-soluble vitamins like B1 (thiamine) and B12.

“Over time, low levels can contribute to fatigue, memory issues, or even worsening diabetic neuropathy,” Mr Thnoia said.

Meanwhile, statins are used by around eight million Brits to lower cholesterol and reduce risk of heart disease. 

They can reduce levels of coenzyme Q10, a nutrient that plays a key role in energy production within our cells, leading to muscle aches and fatigue, the pharmacist said.

Mr Thnoia said patients should not stop taking any prescribed medications but should be aware of the possible side effects.

He added: “There needs to be more education about the impact certain medications have on your body’s ability to absorb nutrients, so that patients are informed about additional steps that they may need to take to improve their general health and wellbeing.”