Get Products of Tax

// WP_Query arguments
$args = array(
	'nopaging'               => false,
	'posts_per_page'         => '20',
	'tax_query'              => array(
		array(
			'taxonomy'         => 'product_cat',
			'terms'            => 'anestesicos',
			'field'            => 'slug',
			'operator'         => 'IN',
		),
	),
);

// The Query
$query = new WP_Query( $args );