library/classes/Prescription.class.php

   1 <?php
   2 require_once (dirname(__FILE__) . "/../sql.inc");
   3 require_once (dirname(__FILE__) . "/../lists.inc");
   4 require_once("ORDataObject.class.php");
   5 require_once("Patient.class.php");
   6 require_once("Person.class.php");
   7 require_once("Provider.class.php");
   8 require_once("Pharmacy.class.php");
   9 require_once("NumberToText.class.php");
  10 //below is required for the set_medication() function
  11
  12 // Below list of terms are deprecated, but we keep this list
  13 //   to keep track of the official openemr drugs terms and
  14 //   corresponding ID's for reference. Official is referring
  15 //   to the default settings after installing OpenEMR.
  16 //
  17 // define('UNIT_BLANK',0);
  18 // define('UNIT_MG',1);
  19 // define('UNIT_MG_1CC',2);
  20 // define('UNIT_MG_2CC',3);
  21 // define('UNIT_MG_3CC',4);
  22 // define('UNIT_MG_4CC',5);
  23 // define('UNIT_MG_5CC',6);
  24 // define('UNIT_MCG',7);
  25 // define('UNIT_GRAMS',8);
  26 //
  27 // define('INTERVAL_BLANK',0);
  28 // define('INTERVAL_BID',1);
  29 // define('INTERVAL_TID',2);
  30 // define('INTERVAL_QID',3);
  31 // define('INTERVAL_Q_3H',4);
  32 // define('INTERVAL_Q_4H',5);
  33 // define('INTERVAL_Q_5H',6);
  34 // define('INTERVAL_Q_6H',7);
  35 // define('INTERVAL_Q_8H',8);
  36 // define('INTERVAL_QD',9);
  37 // define('INTERVAL_AC',10); // added May 2008
  38 // define('INTERVAL_PC',11); // added May 2008
  39 // define('INTERVAL_AM',12); // added May 2008
  40 // define('INTERVAL_PM',13); // added May 2008
  41 // define('INTERVAL_ANTE',14); // added May 2008
  42 // define('INTERVAL_H',15); // added May 2008
  43 // define('INTERVAL_HS',16); // added May 2008
  44 // define('INTERVAL_PRN',17); // added May 2008
  45 // define('INTERVAL_STAT',18); // added May 2008
  46 //
  47 // define('FORM_BLANK',0);
  48 // define('FORM_SUSPENSION',1);
  49 // define('FORM_TABLET',2);
  50 // define('FORM_CAPSULE',3);
  51 // define('FORM_SOLUTION',4);
  52 // define('FORM_TSP',5);
  53 // define('FORM_ML',6);
  54 // define('FORM_UNITS',7);
  55 // define('FORM_INHILATIONS',8);
  56 // define('FORM_GTTS_DROPS',9);
  57 // define('FORM_CR',10);
  58 // define('FORM_OINT',11);
  59 //
  60 // define('ROUTE_BLANK',0);
  61 // define("ROUTE_PER_ORIS", 1);
  62 // define("ROUTE_PER_RECTUM", 2);
  63 // define("ROUTE_TO_SKIN", 3);
  64 // define("ROUTE_TO_AFFECTED_AREA", 4);
  65 // define("ROUTE_SUBLINGUAL", 5);
  66 // define("ROUTE_OS", 6);
  67 // define("ROUTE_OD", 7);
  68 // define("ROUTE_OU", 8);
  69 // define("ROUTE_SQ", 9);
  70 // define("ROUTE_IM", 10);
  71 // define("ROUTE_IV", 11);
  72 // define("ROUTE_PER_NOSTRIL", 12);
  73 // define("ROUTE_B_EAR", 13);
  74 // define("ROUTE_L_EAR", 14);
  75 // define("ROUTE_R_EAR", 15);
  76 //
  77 // define('SUBSTITUTE_YES',1);
  78 // define('SUBSTITUTE_NO',2);
  79 //
  80
  81 // Added 7-2009 by BM to incorporate the units, forms, interval, route lists from list_options
  82 //  This mechanism may only be temporary; will likely migrate changes more downstream to allow
  83 //   users the options of using the addlist widgets and validation frunctions from options.inc.php
  84 //   in the forms and output.
  85 function load_drug_attributes($id) {
  86     $res = sqlStatement("SELECT * FROM list_options WHERE list_id = '$id' AND activity = 1 ORDER BY seq");
  87     while ($row = sqlFetchArray($res)) {
  88         if ($row['title'] == '') {
  89          $arr[$row['option_id']] = ' ';
  90         }
  91         else {
  92          $arr[$row['option_id']] = xl_list_label($row['title']);
  93         }
  94     }
  95     return $arr;
  96 }
  97
  98 /**
  99  * class Prescription
 100  *
 101  */
 102 class Prescription extends ORDataObject {
 103
 104     /**
 105      *
 106      * @access public
 107      */
 108
 109     /**
 110      *
 111      * static
 112      */
 113     var $form_array;
 114     var $unit_array;
 115     var $route_array;
 116     var $interval_array;
 117     var $substitute_array;
 118     var $medication_array;
 119     var $refills_array;
 120
 121     /**
 122      *
 123      * @access private
 124      */
 125
 126     var $id;
 127     var $patient;
 128     var $pharmacist;
 129     var $date_added;
 130     var $date_modified;
 131     var $pharmacy;
 132     var $start_date;
 133     var $filled_date;
 134     var $provider;
 135     var $note;
 136     var $drug;
 137     var $rxnorm_drugcode;
 138     var $form;
 139     var $dosage;
 140     var $quantity;
 141     var $size;
 142     var $unit;
 143     var $route;
 144     var $interval;
 145     var $substitute;
 146     var $refills;
 147     var $per_refill;
 148     var $medication;
 149
 150     var $drug_id;
 151     var $active;
 152
 153     /**
 154     * Constructor sets all Prescription attributes to their default value
 155     */
 156
 157     function __construct($id= "", $_prefix = "") {
 158
 159         // Modified 7-2009 by BM to load the arrays from the lists in lists_options.
 160         // Plan for this to only be temporary, hopefully have the lists used directly
 161         //  from forms in future to allow use of widgets etc.
 162         $this->route_array = load_drug_attributes('drug_route');
 163         $this->form_array = load_drug_attributes('drug_form');
 164         $this->interval_array = load_drug_attributes('drug_interval');
 165         $this->unit_array = load_drug_attributes('drug_units');
 166
 167         $this->substitute_array = array("",xl("substitution allowed"),
 168             xl ("do not substitute"));
 169
 170         $this->medication_array = array(0 => xl('No'), 1 => xl('Yes'));
 171
 172         if (is_numeric($id)) { $this->id = $id; }
 173         else { $id = "";}
 174
 175         //$this->unit = UNIT_MG;
 176         //$this->route = ROUTE_PER_ORIS;
 177         //$this->quantity = 1;
 178         //$this->size = 1;
 179         $this->refills = 0;
 180         //$this->form = FORM_TABLET;
 181         $this->substitute = false;
 182         $this->_prefix = $_prefix;
 183         $this->_table = "prescriptions";
 184         $this->pharmacy = new Pharmacy();
 185         $this->pharmacist = new Person();
 186         $this->provider = new Provider($_SESSION['authId']);
 187         $this->patient = new Patient();
 188         $this->start_date = date("Y-m-d");
 189         $this->date_added = date("Y-m-d");
 190         $this->date_modified = date("Y-m-d");
 191         $this->per_refill = 0;
 192         $this->note = "";
 193
 194         $this->drug_id = 0;
 195         $this->active = 1;
 196
 197         for($i=0;$i<21;$i++) {
 198             $this->refills_array[$i] = sprintf("%02d",$i);
 199         }
 200
 201         if ($id != "") { $this->populate(); }
 202     }
 203
 204     function persist() {
 205         $this->date_modified = date("Y-m-d");
 206         if ($this->id == "") { $this->date_added = date("Y-m-d"); }
 207         if (parent::persist()) { }
 208     }
 209
 210     function populate() {
 211         parent::populate();
 212     }
 213
 214     function toString($html = false) {
 215         $string .= "\n"
 216                 ."ID: " . $this->id . "\n"
 217                 ."Patient:" . $this->patient . "\n"
 218                 ."Patient ID:" . $this->patient->id . "\n"
 219                 ."Pharmacist: " . $this->pharmacist . "\n"
 220                 ."Pharmacist ID: " . $this->pharmacist->id . "\n"
 221                 ."Date Added: " . $this->date_added. "\n"
 222                 ."Date Modified: " . $this->date_modified. "\n"
 223                 ."Pharmacy: " . $this->pharmacy. "\n"
 224                 ."Pharmacy ID:" . $this->pharmacy->id . "\n"
 225                 ."Start Date: " . $this->start_date. "\n"
 226                 ."Filled Date: " . $this->filled_date. "\n"
 227                 ."Provider: " . $this->provider. "\n"
 228                 ."Provider ID: " . $this->provider->id. "\n"
 229                 ."Note: " . $this->note. "\n"
 230                 ."Drug: " . $this->drug. "\n"
 231           ."Code: " . $this->rxnorm_drugcode. "\n"
 232                 ."Form: " . $this->form_array[$this->form]. "\n"
 233                 ."Dosage: " . $this->dosage. "\n"
 234                 ."Qty: " . $this->quantity. "\n"
 235                 ."Size: " . $this->size. "\n"
 236                 ."Unit: " . $this->unit_array[$this->unit] . "\n"
 237                 ."Route: " . $this->route_array[$this->route] . "\n"
 238                 ."Interval: " .$this->interval_array[$this->interval]. "\n"
 239                 ."Substitute: " . $this->substitute_array[$this->substitute]. "\n"
 240                 ."Refills: " . $this->refills. "\n"
 241                 ."Per Refill: " . $this->per_refill . "\n"
 242                 ."Drug ID: " . $this->drug_id . "\n"
 243                 ."Active: " . $this->active;
 244
 245         if ($html) { return nl2br($string); }
 246         else { return $string; }
 247     }
 248     function get_encounter(){
 249         return $_SESSION['encounter'];
 250     }
 251
 252     function get_unit_display( $display_form="" ) {
 253         return( $this->unit_array[$this->unit] );
 254     }
 255
 256     function get_unit() {
 257         return $this->unit;
 258     }
 259     function set_unit($unit) {
 260         if (is_numeric($unit)) { $this->unit = $unit; }
 261     }
 262
 263     function set_id($id) {
 264         if (!empty($id) && is_numeric($id)) { $this->id = $id; }
 265     }
 266     function get_id() {
 267         return $this->id;
 268     }
 269
 270     function get_dosage_display( $display_form="" ) {
 271         if( empty($this->form) && empty($this->interval) ) {
 272             return( $this->dosage );
 273         }
 274         else {
 275             return ($this->dosage . " " . xl('in') . " " . $this->form_array[$this->form] . " " . $this->interval_array[$this->interval]);
 276         }
 277     }
 278
 279     function set_dosage($dosage) {
 280         $this->dosage = $dosage;
 281     }
 282     function get_dosage() {
 283         return $this->dosage;
 284     }
 285
 286     function set_form($form) {
 287         if (is_numeric($form)) { $this->form = $form; }
 288     }
 289     function get_form() {
 290         return $this->form;
 291     }
 292
 293     function set_refills($refills) {
 294         if (is_numeric($refills)) { $this->refills = $refills; }
 295     }
 296     function get_refills() {
 297         return $this->refills;
 298     }
 299
 300     function set_size($size) {
 301        $this->size = preg_replace("/[^0-9\/\.\-]/", "",$size);
 302     }
 303     function get_size() {
 304         return $this->size;
 305     }
 306
 307     function set_quantity($qty) {
 308         $this->quantity = $qty;
 309     }
 310     function get_quantity() {
 311         return $this->quantity;
 312     }
 313
 314     function set_route($route) {
 315         if (is_numeric($route)) { $this->route = $route; }
 316     }
 317     function get_route() {
 318         return $this->route;
 319     }
 320
 321     function set_interval($interval) {
 322         if (is_numeric($interval)) { $this->interval = $interval; }
 323     }
 324     function get_interval() {
 325         return $this->interval;
 326     }
 327
 328     function set_substitute($sub) {
 329         if (is_numeric($sub)) { $this->substitute = $sub; }
 330     }
 331     function get_substitute() {
 332         return $this->substitute;
 333     }
 334     function set_erx_source($erx_source) {
 335         $this->erx_source = $erx_source;
 336     }
 337     function set_medication($med) {
 338         global $ISSUE_TYPES;
 339
 340         $this->medication = $med;
 341
 342         // Avoid making a mess if we are not using the "medication" issue type.
 343         if (isset($ISSUE_TYPES) && !$ISSUE_TYPES['medication']) return;
 344
 345         //below statements are bypassing the persist() function and being used directly in database statements, hence need to use the functions in library/formdata.inc.php
 346         // they have already been run through populate() hence stripped of escapes, so now need to be escaped for database (add_escape_custom() function).
 347
 348         //check if this drug is on the medication list
 349         $dataRow = sqlQuery("select id from lists where type = 'medication' and activity = 1 and (enddate is null or cast(now() as date) < enddate) and upper(trim(title)) = upper(trim('" . add_escape_custom($this->drug) . "')) and pid = " . add_escape_custom($this->patient->id) . ' limit 1');
 350
 351         if ($med && !isset($dataRow['id'])){
 352             $dataRow = sqlQuery("select id from lists where type = 'medication' and activity = 0 and (enddate is null or cast(now() as date) < enddate) and upper(trim(title)) = upper(trim('" . add_escape_custom($this->drug) . "')) and pid = " . add_escape_custom($this->patient->id) . ' limit 1');
 353
 354             if (!isset($dataRow['id'])){
 355                 //add the record to the medication list
 356                 sqlInsert("insert into lists(date,begdate,type,activity,pid,user,groupname,title) values (now(),cast(now() as date),'medication',1," . add_escape_custom($this->patient->id) . ",'" . $$_SESSION['authUser']. "','" . $$_SESSION['authProvider'] . "','" . add_escape_custom($this->drug) . "')");
 357             }
 358             else {
 359                 $dataRow = sqlQuery('update lists set activity = 1'
 360                             . " ,user = '" . $$_SESSION['authUser']
 361                             . "', groupname = '" . $$_SESSION['authProvider'] . "' where id = " . $dataRow['id']);
 362             }
 363         }
 364         elseif (!$med && isset($dataRow['id'])) {
 365             //remove the drug from the medication list if it exists
 366             $dataRow = sqlQuery('update lists set activity = 0'
 367                             . " ,user = '" . $$_SESSION['authUser']
 368                             . "', groupname = '" . $$_SESSION['authProvider'] . "' where id = " . $dataRow['id']);
 369         }
 370     }
 371
 372     function get_medication() {
 373         return $this->medication;
 374     }
 375
 376     function set_per_refill($pr) {
 377         if (is_numeric($pr)) { $this->per_refill = $pr; }
 378     }
 379     function get_per_refill() {
 380         return $this->per_refill;
 381     }
 382
 383     function set_patient_id($id) {
 384         if (is_numeric($id)) { $this->patient = new Patient($id); }
 385     }
 386     function get_patient_id() {
 387         return $this->patient->id;
 388     }
 389
 390     function set_provider_id($id) {
 391         if (is_numeric($id)) { $this->provider = new Provider($id); }
 392     }
 393     function get_provider_id() {
 394         return $this->provider->id;
 395     }
 396
 397     function set_provider($pobj) {
 398         if (get_class($pobj) == "provider") { $this->provider = $pobj; }
 399     }
 400
 401     function set_pharmacy_id($id) {
 402         if (is_numeric($id)) { $this->pharmacy = new Pharmacy($id); }
 403     }
 404     function get_pharmacy_id() {
 405         return $this->pharmacy->id;
 406     }
 407
 408     function set_pharmacist_id($id) {
 409         if (is_numeric($id)) { $this->pharmacist = new Person($id); }
 410     }
 411     function get_pharmacist() {
 412         return $this->pharmacist->id;
 413     }
 414
 415     function get_start_date_y() {
 416         $ymd = explode("-",$this->start_date);
 417         return $ymd[0];
 418     }
 419     function set_start_date_y($year) {
 420         if (is_numeric($year)) {
 421             $ymd = explode("-",$this->start_date);
 422             $ymd[0] = $year;
 423             $this->start_date = $ymd[0] ."-" . $ymd[1] ."-" . $ymd[2];
 424         }
 425     }
 426     function get_start_date_m() {
 427         $ymd = explode("-",$this->start_date);
 428         return $ymd[1];
 429     }
 430     function set_start_date_m($month) {
 431         if (is_numeric($month)) {
 432             $ymd = explode("-",$this->start_date);
 433             $ymd[1] = $month;
 434             $this->start_date = $ymd[0] ."-" . $ymd[1] ."-" . $ymd[2];
 435         }
 436     }
 437     function get_start_date_d() {
 438         $ymd = explode("-",$this->start_date);
 439         return $ymd[2];
 440     }
 441     function set_start_date_d($day) {
 442         if (is_numeric($day)) {
 443             $ymd = explode("-",$this->start_date);
 444             $ymd[2] = $day;
 445             $this->start_date = $ymd[0] ."-" . $ymd[1] ."-" . $ymd[2];
 446         }
 447     }
 448     function get_start_date() {
 449         return $this->start_date;
 450     }
 451     function set_start_date($date) {
 452         return $this->start_date = $date;
 453     }
 454
 455     // TajEmo work by CB 2012/05/30 01:56:32 PM added encounter for auto ticking of checkboxes
 456     function set_encounter($enc) {
 457         return $this->encounter = $enc;
 458     }
 459
 460     function get_date_added() {
 461         return $this->date_added;
 462     }
 463     function set_date_added($date) {
 464         return $this->date_added = $date;
 465     }
 466
 467     function get_date_modified() {
 468         return $this->date_modified;
 469     }
 470     function set_date_modified($date) {
 471         return $this->date_modified = $date;
 472     }
 473
 474     function get_filled_date() {
 475         return $this->filled_date;
 476     }
 477     function set_filled_date($date) {
 478         return $this->filled_date = $date;
 479     }
 480
 481     function set_note($note) {
 482         $this->note = $note;
 483     }
 484     function get_note() {
 485         return $this->note;
 486     }
 487
 488     function set_drug($drug) {
 489         $this->drug = $drug;
 490     }
 491     function get_drug() {
 492         return $this->drug;
 493     }
 494
 495     function set_rxnorm_drugcode($rxnorm_drugcode) {
 496         $this->rxnorm_drugcode = $rxnorm_drugcode;
 497     }
 498     function get_rxnorm_drugcode() {
 499         return $this->rxnorm_drugcode;
 500     }
 501
 502     function get_filled_by_id() {
 503         return $this->pharmacist->id;
 504     }
 505     function set_filled_by_id($id) {
 506         if (is_numeric($id)) { return $this->pharmacist->id = $id; }
 507     }
 508
 509     function set_drug_id($drug_id) {
 510         $this->drug_id = $drug_id;
 511     }
 512     function get_drug_id() {
 513         return $this->drug_id;
 514     }
 515
 516     function set_active($active) {
 517         $this->active = $active;
 518     }
 519     function get_active() {
 520         return $this->active;
 521     }
 522
 523     function get_prescription_display() {
 524         $pconfig = $GLOBALS['oer_config']['prescriptions'];
 525
 526         switch ($pconfig['format']) {
 527             case "FL":
 528                 return $this->get_prescription_florida_display();
 529                 break;
 530             default:
 531                 break;
 532         }
 533
 534         $sql = "SELECT * FROM users JOIN facility AS f ON f.name = users.facility where users.id ='" . add_escape_custom($this->provider->id) . "'";
 535         $db = get_db();
 536         $results = $db->Execute($sql);
 537         if (!$results->EOF) {
 538             $string = $results->fields['name'] . "\n"
 539                     . $results->fields['street'] . "\n"
 540                     . $results->fields['city'] . ", " . $results->fields['state'] . " " . $results->fields['postal_code'] . "\n"
 541                     . $results->fields['phone'] . "\n\n";
 542         }
 543
 544         $string .= ""
 545                 ."Prescription For:" . "\t" .$this->patient->get_name_display() . "\n"
 546                 ."DOB:"."\t".$this->patient->get_dob()."\n"
 547                 ."Start Date: " . "\t\t" . $this->start_date. "\n"
 548                 ."Provider: " . "\t\t" . $this->provider->get_name_display(). "\n"
 549                 ."Provider DEA No.: " . "\t\t" . $this->provider->federal_drug_id. "\n"
 550                 ."Drug: " . "\t\t\t" . $this->drug. "\n"
 551                 ."Dosage: " . "\t\t" . $this->dosage . " in ". $this->form_array[$this->form]. " form " . $this->interval_array[$this->interval]. "\n"
 552                 ."Qty: " . "\t\t\t" . $this->quantity. "\n"
 553                 ."Medication Unit: " . "\t" . $this->size  . " ". $this->unit_array[$this->unit] . "\n"
 554                 ."Substitute: " . "\t\t" . $this->substitute_array[$this->substitute]. "\n";
 555         if ($this->refills > 0) {
 556             $string .= "Refills: " . "\t\t" . $this->refills. ", of quantity: " . $this->per_refill ."\n";
 557         }
 558         $string .= "\n"."Notes: \n" . $this->note . "\n";
 559         return $string;
 560     }
 561
 562     function get_prescription_florida_display() {
 563
 564         $db = get_db();
 565         $ntt = new NumberToText($this->quantity);
 566         $ntt2 = new NumberToText($this->per_refill);
 567         $ntt3 = new NumberToText($this->refills);
 568
 569         $string = "";
 570
 571         $gnd = $this->provider->get_name_display();
 572
 573         while(strlen($gnd)<31) { $gnd .= " "; }
 574
 575         $string .= $gnd . $this->provider->federal_drug_id . "\n";
 576
 577         $sql = "SELECT * FROM users JOIN facility AS f ON f.name = users.facility where users.id ='" . add_escape_custom($this->provider->id) . "'";
 578         $results = $db->Execute($sql);
 579
 580         if (!$results->EOF) {
 581             $rfn = $results->fields['name'];
 582
 583             while(strlen($rfn)<31) { $rfn .= " "; }
 584
 585             $string .= $rfn . $this->provider->get_provider_number_default() . "\n"
 586                     . $results->fields['street'] . "\n"
 587                     . $results->fields['city'] . ", " . $results->fields['state'] . " " . $results->fields['postal_code'] . "\n"
 588                     . $results->fields['phone'] . "\n";
 589         }
 590
 591         $string .= "\n";
 592         $string .= strtoupper($this->patient->lname) . ", " . ucfirst($this->patient->fname) . " " . $this->patient->mname . "\n";
 593         $string .= "DOB " .  $this->patient->date_of_birth . "\n";
 594         $string .= "\n";
 595         $string .= date("F j, Y", strtotime($this->start_date)) . "\n";
 596         $string .= "\n";
 597         $string .= strtoupper($this->drug) . " " . $this->size  . " ". $this->unit_array[$this->unit] . "\n";
 598         if (strlen($this->note) > 0) {
 599             $string .= "Notes: \n" . $this->note . "\n";
 600         }
 601         if (!empty($this->dosage)) {
 602             $string .= $this->dosage;
 603             if (!empty($this->form)){
 604                 $string .= " " . $this->form_array[$this->form];
 605             }
 606             if (!empty($this->interval)) {
 607                 $string .= " " . $this->interval_array[$this->interval];
 608             }
 609             if (!empty($this->route)) {
 610                 $string .= " " . $this->route_array[$this->route] . "\n";
 611             }
 612         }
 613         if (!empty($this->quantity)) {
 614             $string .= "Disp: " . $this->quantity . " (" . trim(strtoupper($ntt->convert())) . ")" . "\n";
 615         }
 616         $string .= "\n";
 617         $string .= "Refills: " . $this->refills . " (" . trim(strtoupper($ntt3->convert())) ."), Per Refill Disp: " . $this->per_refill . " (" . trim(strtoupper($ntt2->convert())) . ")" ."\n";
 618         $string .= $this->substitute_array[$this->substitute]. "\n";
 619         $string .= "\n";
 620
 621         return $string;
 622     }
 623
 624     static function prescriptions_factory($patient_id,
 625                             $order_by = "active DESC, date_modified DESC, date_added DESC")
 626     {
 627         $prescriptions = array();
 628         require_once (dirname(__FILE__) . "/../translation.inc.php");
 629         $p = new Prescription();
 630         $sql = "SELECT id FROM  " . $p->_table . " WHERE patient_id = " .
 631                 add_escape_custom($patient_id) .
 632                 " ORDER BY " . add_escape_custom($order_by);
 633         $results = sqlQ($sql);
 634         while ($row = sqlFetchArray($results) ) {
 635             $prescriptions[] = new Prescription($row['id']);
 636         }
 637         return $prescriptions;
 638     }
 639
 640     function get_dispensation_count() {
 641         if (empty($this->id)) return 0;
 642         $refills_row = sqlQuery("SELECT count(*) AS count FROM drug_sales " .
 643                     "WHERE prescription_id = '" . $this->id . "' AND quantity > 0");
 644         return $refills_row['count'];
 645     }
 646
 647 }// end of Prescription
 648 ?>