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Another batch of blood pressure medication is being recalled.

Accord Healthcare Inc. announced this week it is voluntarily recalling a specific lot of blood pressure medication after discovering a bottle that had the wrong pills in it.

The 100-pill bottle was supposed to have Hydrochlorothiazide Tablets USP 12.5 mg. Instead, it was filled with Spironolactone Tablets USP 25 mg. That medication is used to treat congestive heart failure and cirrhosis of the liver, among other ailments.

Food and Drug Administration (FDA) officials told USA Today that the effects of taking this incorrect medication range from "limited" to "life threatening," depending on the individual.

This news comes just a few weeks after the FDA expanded a recall involving drugs containing valsartan, which is used to treat high blood pressure and heart failure.

The products were voluntarily recalled due to the presence of an impurity, N-nitrosodimethylamine (NDMA), a substance that poses a potential cancer risk.

NDMA is classified as a probable human carcinogen based on laboratory tests.

In early August, FDA officials announced they had updated the list of drugs affected by the recall, which was originally announced in July. They also noted the recall is now a worldwide recommendation.

The agency also released a list of drugs not affected by the recall.

Multiple companies are voluntarily recalling their medications, including valsartan from Major Pharmaceuticals, Solco Healthcare, and Teva Pharmaceuticals Industries Ltd., as well as valsartan/hydrochlorothiazide from Solco and Teva.

The FDA said in a statement that “the presence of NDMA was unexpected and is thought to be related to changes in the way the active substance was manufactured.”

The affected drugs are all generic versions of brand name Diovan, which is made by Novartis International AG. Diovan and generic versions made by other companies are not included in the recall.

“It’s not the drug valsartan that’s the problem. It’s a contaminant that was included in the manufacturing process that’s the problem. Patients shouldn’t lose faith in the drug itself,” said Dr. Victoria Shin, a cardiologist with Torrance Memorial Medical Center in Torrance, California.

She added that she doesn’t expect the recalls to affect patient care because of the availability of other valsartan products.

The FDA said in the statement that it’s “working with the affected companies to reduce or eliminate the valsartan API impurity from future products.” It’s also working on ensuring that the United States has an “adequate supply of unaffected medications.”

CNN reports that the external supplier linked to the NDMA impurity in the recalled products has stopped distributing its valsartan ingredient.

What should patients do?

The FDA lists recall instructions provided by the specific companies, including the drug lot numbers included in the recall and how to return or dispose of the affected medicines.

It noted that patients should look at the name of the drug and company listed on the prescription label to determine if their medication has been recalled. They can also contact the pharmacy where they picked it up.

These medications are used to treat serious medical conditions — high blood pressure and heart failure.

So “patients should not stop their medication on their own without consulting a physician,” said Shin. “This can cause elevated and uncontrolled blood pressure which can potentially have severe health consequences.”

A doctor or pharmacist can also help patients find an alternative medication. This may be another valsartan product or a different medication from the same class of drugs, known as angiotensin receptor blockers.

These blockers include losartan, olmesartan, irbesartan, and others.

Patients should monitor their blood pressure closely after switching medicines. People may respond differently to the new medication. The dose may also need to be adjusted under the guidance of a healthcare provider.

Whether patients end up paying more for their new medication depends on which product they switch to. GoodRx lists the retail price of brand-name Diovan as around $250, with generic versions of valsartan as low as $11.32. Health insurance plans may also often have lower copays for certain medicines.

According to the U.S. Environmental Protection Agency (EPA), NDMA forms during both industrial and natural processes. It was formerly used in the production of liquid rocket fuel, antioxidants, and lubricant additives.

The EPA notes that what’s known about the dangers of this chemical comes mainly from laboratory studies. Exposure to high levels of NDMA may cause liver damage in people.

The long-term cancer risks of the levels of NDMA found in recalled valsartan products is unknown.

FDA officials said in a statement that it’s investigating how much NDMA was present in the recalled products and is assessing what effect this might have on patients who had been taking the medications.