Brooklyn

A stick-up at a pharmacy sent a neighboring grammar school into lockdown as cops searched for the armed bandit in Sheepshead Bay yesterday.

The crook, armed with a silver handgun and wearing gloves, stormed into the V Pharmacy on East 22nd Street near Avenue V at about noon yesterday and announced a stick-up.

He escaped, but it wasn’t clear if anything was taken.

Meanwhile, police ordered PS 206, across the street from the scene, locked down while cops searched for the man, who was still at large last night.

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A crazed woman was nabbed after dousing her boyfriend and herself with sulfuric acid, police sources said.

Geraldine McCoy, 30, began arguing with Henry Maurasse, 55, over money in his apartment on Rogers Avenue near Foster Avenue in Flatbush at 5:30 p.m. Sunday, the sources said.

She allegedly poured a bottle of acid on the victim while he lay in bed.

When Maurasse tried to wrestle the bottle away, the acid also hit McCoy, the sources said.

Responding police found the couple in the shower with blisters and burns on their bodies.

They suffered second- and third-degree burns and were taken to New York-Presbyterian Hospital.

The acid left holes in the curtains, bed and dresser drawer in the bedroom, police sources said.

McCoy was charged with assault, menacing and criminal possession of a weapon.

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A counterfeiter was busted in Canarsie after he gave a fake $100 bill to a street vendor for flowers, authorities said yesterday.

Sophonie Moncher, 33, made the purchase on Flatlands Avenue near Rockaway Parkway at 8:30 a.m. Sunday, cops said.

The vendor gave $85 in change to Moncher, who then walked away.

Moments later, the vendor realized the bill was fake and quickly flagged down a cop, who busted Moncher nearby.

Moncher, who was charged with petit larceny and possession of a forged instrument, told cops that he received bogus bills while gambling the night before, sources said.

Bronx

A man allegedly confessed to fatally stabbing his girlfriend in her Morrisania home.

Gregory Thompson, 58, a k a “Green Eyes,” allegedly stabbed the victim 47 times in her apartment on Union Avenue near East 169th Street at 6 p.m. Friday before fleeing.

A friend of the 43-year-old victim called police after stumbling upon the horrific scene.

Police found the victim lying face up on the floor with a pillow over her face and stab wounds to her neck and torso.

The next day, police arrested Thompson, who lives on the same floor as the victim, after he allegedly confessed.

He was charged with murder and manslaughter.

Manhattan

A young man was robbed of his BlackBerry and sneakers following an early-morning encounter with a thug aboard a subway train.

The 19-year-old straphanger was on a Manhattan-bound R train at about 3 a.m. Sunday as it traveled in a tunnel from Brooklyn to Manhattan. Suddenly, a man walked up, punched him in his face and snatched his BlackBerry and a backpack containing sneakers and clothing.

The thug exited the train when it pulled into the Whitehall Street station.

Staten Island

A man has been arrested for stabbing a relative during an argument in Mariners Harbor, authorities said yesterday.

Julian Figueroa, 21, clashed for unknown reasons with the male victim in a house on South Avenue near Arlington Place around 9 a.m. on May 3, cops said.

Figueroa allegedly pulled a knife and plunged it into the victim’s chest.

Police arrested Figueroa on Friday on assault charges, according to a spokesman for DA Daniel Donovan.

The victim was treated for injuries that were not life-threatening at Richmond University Hospital.

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A Staten Island teen who was released on drug charges from Bronx Criminal Court over the weekend was quickly busted for an unrelated murder after he stepped out of the courthouse, authorities said yesterday.

Cops waited for Ricardo Mendez, 18, outside the courthouse Saturday and charged him with murdering Didier Jean in Port Richmond earlier this month.

On May 3, Mendez thought Jean dissed him during an argument on Harrison Avenue near Faber Street.

So Mendez pulled a gun and shot Jean in the face, killing him, cops said.