here is my code
<?php
global $wpdb;
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1; // se não tiver pagina seta como 1
$args = array ( 'post_type' => array( 'med', 'post' ),
'tax_query' => array(
'relation' => 'AND',
array( 'taxonomy' => 'post_tag', 'field' => 'slug', 'terms' => $tag )
),
'order' => 'ASC',
'orderby' => 'title',
'paged' => $paged
);
$wp_query1 = new WP_Query( $args );
while ( $wp_query1->have_posts() ) : $wp_query1->the_post();
?>
<div class="boxCat">
<a href="<?php the_permalink(); ?>" ><h1><?php the_title(); ?></h1></a>
</div>
<?php
endwhile;
wp_reset_query(); //Reset Query
?>
<?php if ( function_exists('wp_pagenavi') ) wp_pagenavi( array( 'query' => $wp_query1 ) ); wp_reset_postdata(); ?>