drupal 7 user registration custom url returning a blank page I dont think my url is working. I am trying to use page/medical then use the page callback to redirect to medical_reg_form_user_register_form_alter. Instead of displaying the form I get a blank page.   

function medical_reg_user_register_menu() {
  $items['page/medical'] = array(
    'page callback' =&gt; 'medical_reg_form_user_register_form_alter',
    'access arguments' =&gt; array('access content'),
    'type' =&gt; MENU_CALLBACK
    );
  return $items;
}

function medical_reg_form_user_register_form_alter(&amp;$form, &amp;$form_state, $form_id) {
  $form['#theme'] = 'medical_register'; 
  $form['actions']['submit']['#value'] = t('Nextdfd');
}
You can't call a hook in hook_menu(). You can either create an alias for the user registration page or replace your menu item with:

function medical_reg_user_register_menu() {
  $items['page/medical'] = array(
    'page callback' =&gt; 'drupal_get_form',
    'page arguments' =&gt; array('user_register_form'),
    'access arguments' =&gt; array('access content'),
    'type' =&gt; MENU_CALLBACK
    );
  return $items;
}