Prescription drugs were stolen in two separate armed robberies of pharmacies on the western side of San Francisco on Monday, police said Tuesday.

The first robbery was reported at about 1:45 p.m. in the 1900 block of Clement St in the Richmond District.

Two suspects entered the pharmacy, pointed a gun at an employee and ordered him to get on the floor, according to police.

The suspects, described as two men in their early to mid-20s, then took a number of prescription drugs and fled the store. They had not been found as of Tuesday morning, police said.

Then, at about 6:40 p.m., two suspects entered a pharmacy in the 1800 block of Noriega St in the city's Sunset District, according to police.

The suspects also pointed a gun at employees and ordered them to get on the ground. The suspects were then directed to a cabinet that they ransacked for the prescription drugs inside, police said.

The drugs were dumped into a backpack one of the suspects was carrying. They then fled and remained at large Tuesday morning.

No one was injured in either robbery.

Police spokesman Officer Gordon Shyy said he did not know whether the cases were related but said, "it does look like it's possible, based on similar suspect descriptions and modus operandi."

Anyone with information was encouraged to call the Police Department's anonymous tip line at (415) 575-4444 or to send a tip by text message to TIP411.