Which viagra pills are the best?

The Viagra pill was once the “next best thing to Viagra.”

But that’s no longer the case.

According to a new study by researchers at Johns Hopkins University, the pill’s popularity has been declining for a decade.

A whopping 40% of respondents to a survey released last month by the Centers for Disease Control and Prevention (CDC) said they have stopped using Viagra due to its side effects.

The study was based on the results of a nationwide survey conducted by researchers from Johns Hopkins Bloomberg School of Public Health.

That survey was published online in the March issue of the American Journal of Public-Health Nursing.

As of last November, there were more than 5.6 million Viagra prescriptions written in the U.S. The most popular drug is Pfizer’s $12,500 pill, with more than 1.2 million prescriptions written each year, according to the survey.

That’s nearly a third of the country’s total total prescriptions.

Pfizer is the second largest prescription drug manufacturer in the world with $1.3 trillion in annual sales.

The pharmaceutical industry has faced criticism for what critics have said is a lack of transparency and accountability for its products.

The company’s CEO, Martin Shkreli, has been arrested twice in the past few months and faced charges of fraud and racketeering.

In December, Shkrelli was charged with defrauding Medicare by overcharging the government $2 billion in payments in 2015.

Shkrilli has pleaded not guilty.

According a press release from the Johns Hopkins researchers, the decline in Viagra sales is tied to the FDA’s decision in 2015 to allow the use of Viagra without a prescription.

This allowed doctors to prescribe it to people without having to obtain a prescription from their doctors.

As a result, the price of the pill was lowered.

But as the opioid crisis worsens, the drug is becoming more expensive and is no longer a cost-effective way to treat pain, according the researchers.

The researchers also found that in recent years, Viagra is becoming less popular among younger adults.

About 20% of Americans age 18 to 24 have taken Viagra in the last three years, and the proportion of that group who stopped taking the pill is dropping from a high of 24% in 2014 to just 7% in 2015, according.

The Johns Hopkins study also found the number of people using the pill dropped from about 17 million prescriptions in 2009 to about 12 million in 2015 — about a 10% drop.

That number is about double the number prescribed by doctors, the researchers said.

“The reason we see these dramatic drops in prescriptions is the fact that a number of doctors are not getting back to their customers,” said Dr. Jessica Lippman, one of the study’s co-authors.

“It is a big reason why the pill has taken off.”

It’s not just young adults, either.

The majority of women under the age of 30 have stopped taking Viagra.

The survey found that fewer than half of women ages 45 to 54 have used the pill in the previous three years.

That age group has been hit hardest by the opioid epidemic.

A survey from the U,S.

Department of Health and Human Services found that more than 40% have stopped receiving the pill, according a statement from the CDC.

About 10% of people ages 55 to 64 have stopped.

About 7% of those over 65 have stopped, the survey said.

Lippmann said the survey is just one piece of evidence of the rise in prescription painkiller usage among the elderly and people with chronic pain.

“We know that prescription painkillers are a part of a larger issue of rising opioid use,” Lippmen said.

She also said the trend of seniors taking the pills could be connected to the fact doctors are less willing to prescribe opioids for people over the age, and are more likely to prescribe them for people under the legal limit of prescription pain medication.

“What we’re seeing is that people are increasingly choosing not to get their medicine from doctors,” Lizzmann said.

In other words, seniors are choosing to avoid prescriptions for their chronic pain and taking their pain medication at home, rather than going to the doctor.

“If you want to take your medication in a safe environment, you’re not going to get that from a doctor, so you might as well go home and do it yourself,” Lipsman said.