One customer at the pharmacy, Richard Stables, said he sometimes had to go back to his doctor to get alternative prescriptions.
“It’s blood pressure tablets, so you could have a stroke or heart attack any second,” he said.
“It’s a bit annoying [to] keep going up and down, up and down – more stress.”
Most medicines in the UK are in good supply, a spokesperson for the Department of Health spokesperson said.
“This government is investing in the UK medicine manufacturing industry to manage supply disruptions where they occur,” they added.
“Including up to £520m in the Life Sciences Innovative Manufacturing Fund to boost UK production.
“If you’re affected by a shortage, speak to your pharmacist. They can advise whether an alternative medicine or formulation is right for you, or help you find a pharmacy that has it in stock.”
But the Epilepsy Society warned that some people with the condition cannot change brands without risking seizures.