diff --git a/server/gameserver/constant.h b/server/gameserver/constant.h
index c0fd1e3..1991e14 100755
--- a/server/gameserver/constant.h
+++ b/server/gameserver/constant.h
@@ -103,6 +103,7 @@ const int DEF_WEAPON_ID = 12103;
 const int GAS_INACTIVE_TIME = 30;
 const int SERVER_FRAME_RATE = 20;
 const int SYNC_FRAME_RATE = 10;
+const float FRAME_RATE_MS = 1000.0f / SERVER_FRAME_RATE;
 
 const int MAX_INVENTORY_NUM = 17;
 const int MAX_WEAPON_NUM = 5;
diff --git a/server/gameserver/human.h b/server/gameserver/human.h
index dea7ee0..22f2d48 100644
--- a/server/gameserver/human.h
+++ b/server/gameserver/human.h
@@ -9,6 +9,12 @@ namespace MetaData
     struct Equip;
 }
 
+enum HumanStatus
+{
+    HS_PainKiller = 1,
+};
+
+struct xtimer_list;
 class CircleCollider;
 class Obstacle;
 class Human : public Entity
@@ -48,6 +54,7 @@ class Human : public Entity
     long long poisoning_time = 0;
     long long dead_frameno = 0;
     long long join_frameno = 0;
+    int status = 0;
 
     Weapon default_weapon;
     std::vector<Weapon> weapons;
@@ -63,6 +70,9 @@ class Human : public Entity
 
     bool send_gameover = false;
 
+    int pain_killer_frameno = 0;
+    xtimer_list* pain_killer_timer = nullptr;
+
     Human();
     virtual ~Human() override;
     virtual void Initialize() override;
diff --git a/server/gameserver/player.cc b/server/gameserver/player.cc
index 88b4c79..d4a3dee 100644
--- a/server/gameserver/player.cc
+++ b/server/gameserver/player.cc
@@ -204,15 +204,33 @@ void Player::UpdateAction()
                 case IS_PAIN_KILLER:
                     {
                         MetaData::Equip* item_meta = MetaMgr::Instance()->GetEquipBySlotId(action_item_id);
-                        if (item_meta){
+                        if (item_meta && !pain_killer_timer){
                             if (inventory[item_meta->i->_inventory_slot()] > 0) {
-                                float old_health = health;
-                                health += item_meta->i->heal();
-                                health = std::min(health, GetMaxHP());
-                                stats.heal_amount += health - old_health;
+                                pain_killer_frameno = room->frame_no;
+                                pain_killer_timer = room->xtimer.AddRepeatTimerAndAttach(
+                                                                                         SERVER_FRAME_RATE,
+                                                                                         a8::XParams()
+                                                                                         .SetSender(this)
+                                                                                         .SetParam1(item_meta->i->heal())
+                                                                                         .SetParam2(item_meta->i->time())
+                                                                                         .SetParam3(0),
+                                                                                         [] (const a8::XParams& param)
+                                                                                         {
+                                                                                             Human* hum = (Human*)param.sender.GetUserData();
+                                                                                             float old_health = hum->health;
+                                                                                             hum->health += param.param2.GetDouble();
+                                                                                             hum->health = std::min(hum->health, hum->GetMaxHP());
+                                                                                             hum->stats.heal_amount += hum->health - old_health;
+                                                                                             hum->SyncAroundPlayers();
+                                                                                             if (hum->room->frame_no - hum->pain_killer_frameno > param.param2.GetInt() * SERVER_FRAME_RATE) {
+                                                                                                 hum->room->xtimer.DeleteTimer(hum->pain_killer_timer);
+                                                                                                 hum->pain_killer_timer = nullptr;
+                                                                                             }
+                                                                                         },
+                                                                                         &xtimer_attacher.timer_list_
+                                                                                         );
                                 --inventory[item_meta->i->_inventory_slot()];
                                 need_sync_active_player = true;
-                                SyncAroundPlayers();
                             }
                         }
                     }