With more medications being sold over the counter, consumers in the effort to save money, are buying them but if you are taking medications such as Coumadin, you could getting yourself into a lot of trouble.

Coumadin is often prescribed for people who have heart surgery or vascular complications.

"Coumadin is an anti-coagulant drug which works on the vitamin K synthesis, so it works by reducing the body's ability to clot,” said Paul Flatley, pharmacist.

Too much of Coumadin can be deadly.

"We are talking about a drug that works on the coagulant cascade. You can bleed out, so you can lead to stroke, death, ischemic events,” said Flatley.

Coumadin works on thinning the blood. Even over the counter products can affect enzymes metabolizing it, such as Zantac, used to treat acid reflux.

"There is a drug class called proton pump inhibitors, they are used for gird and reflux to decrease the body's acidity, so somebody who is taking that could affect the Coumadin dose if they are taking that in prescription medication,” said Flatley.

While Coumadin is a blood thinner, vitamin K is in the blood clotting process and they work against each other. While vitamin K has to be prescribed by the doctor, it is available in what we eat, specifically green, leafy vegetables.

“Anyone who has a healthier diet, you have to worry about salad, kale; it introduces vitamin K back into the body and could affect what the Coumadin is going to reduce,” said Flatley.

While vitamin K must be prescribed, other over the counter vitamins and supplements need to be monitored.

"I tell it's an important medication and definitely contact their pharmacist or health care professional to tell them what else they are on. Also their physical activity, if they are prone to falls, or cutting, using knives, we have to worry about people bleeding out as well,” said Flatley.