diff --git a/backend/templates/pmr.html b/backend/templates/pmr.html
index a1c7be2..fea09f6 100644
--- a/backend/templates/pmr.html
+++ b/backend/templates/pmr.html
@@ -311,6 +311,66 @@
             text-align: center;
             color: #94a3b8;
         }
+        
+        /* 처방 비교 상태 */
+        .med-status {
+            display: inline-block;
+            padding: 2px 8px;
+            border-radius: 4px;
+            font-size: 0.7rem;
+            font-weight: 600;
+            margin-left: 8px;
+        }
+        .status-added { background: #dcfce7; color: #166534; }
+        .status-removed { background: #fee2e2; color: #991b1b; }
+        .status-changed { background: #fef3c7; color: #92400e; }
+        .status-same { background: #f1f5f9; color: #64748b; }
+        
+        tr.row-added { background: #f0fdf4 !important; }
+        tr.row-removed { background: #fef2f2 !important; opacity: 0.7; }
+        tr.row-changed { background: #fffbeb !important; }
+        
+        .change-arrow {
+            color: #94a3b8;
+            margin: 0 4px;
+        }
+        .change-from {
+            text-decoration: line-through;
+            color: #94a3b8;
+        }
+        .change-to {
+            background: #fbbf24;
+            padding: 2px 6px;
+            border-radius: 4px;
+            font-weight: 600;
+        }
+        
+        /* 비교 모드 토글 */
+        .compare-toggle {
+            display: flex;
+            align-items: center;
+            gap: 8px;
+            padding: 8px 15px;
+            background: #f8fafc;
+            border-bottom: 1px solid #e2e8f0;
+            font-size: 0.85rem;
+        }
+        .compare-toggle input[type="checkbox"] {
+            width: 18px;
+            height: 18px;
+            cursor: pointer;
+        }
+        .compare-legend {
+            display: flex;
+            gap: 12px;
+            margin-left: auto;
+            font-size: 0.75rem;
+        }
+        .compare-legend span {
+            display: flex;
+            align-items: center;
+            gap: 4px;
+        }
     </style>
 </head>
 <body>
@@ -362,6 +422,16 @@
                     <div class="text">환자를 선택하세요</div>
                 </div>
             </div>
+            <div class="compare-toggle" id="compareToggle" style="display:none;">
+                <input type="checkbox" id="compareMode" onchange="toggleCompareMode()">
+                <label for="compareMode">이전 처방과 비교</label>
+                <div class="compare-legend" id="compareLegend" style="display:none;">
+                    <span><span class="med-status status-added">🆕 추가</span></span>
+                    <span><span class="med-status status-changed">🔄 변경</span></span>
+                    <span><span class="med-status status-removed">❌ 중단</span></span>
+                    <span><span class="med-status status-same">✓ 동일</span></span>
+                </div>
+            </div>
             <div class="action-bar" id="actionBar" style="display:none;">
                 <button class="btn btn-secondary" onclick="selectAll()">전체 선택</button>
                 <button class="btn btn-secondary" onclick="previewLabels()" style="background:#3b82f6;color:#fff;">👁️ 미리보기</button>
@@ -401,8 +471,10 @@
     <script>
         let currentPrescriptionId = null;
         let currentPatientCode = null;
+        let currentMedications = [];
         let historyData = [];
         let historyIndex = 0;
+        let compareMode = false;
         
         // HTML 이스케이프
         function escapeHtml(text) {
@@ -547,6 +619,9 @@
                     
                     document.getElementById('actionBar').style.display = 'flex';
                     
+                    // 현재 약품 저장
+                    currentMedications = data.medications;
+                    
                     // 이전 처방 로드
                     currentPatientCode = data.patient.code;
                     if (currentPatientCode) {
@@ -571,9 +646,11 @@
                     historyData = data.history;
                     historyIndex = 0;
                     section.style.display = 'block';
+                    document.getElementById('compareToggle').style.display = 'flex';
                     renderHistory();
                 } else {
                     section.style.display = 'none';
+                    document.getElementById('compareToggle').style.display = 'none';
                     historyData = [];
                 }
             } catch (err) {
@@ -642,6 +719,7 @@
             if (historyIndex > 0) {
                 historyIndex--;
                 renderHistory();
+                if (compareMode) applyCompareMode();
             }
         }
         
@@ -649,14 +727,186 @@
             if (historyIndex < historyData.length - 1) {
                 historyIndex++;
                 renderHistory();
+                if (compareMode) applyCompareMode();
             }
         }
         
+        // 비교 모드 토글
+        function toggleCompareMode() {
+            compareMode = document.getElementById('compareMode').checked;
+            document.getElementById('compareLegend').style.display = compareMode ? 'flex' : 'none';
+            
+            if (compareMode) {
+                applyCompareMode();
+            } else {
+                // 비교 모드 해제 - 테이블 다시 렌더링
+                rerenderMedicationTable();
+            }
+        }
+        
+        // 처방 비교 로직
+        function comparePrescriptions(current, previous) {
+            const result = [];
+            const prevMap = new Map(previous.map(m => [m.medication_code, m]));
+            const currCodes = new Set(current.map(m => m.medication_code));
+            
+            // 현재 처방 약품 처리
+            for (const curr of current) {
+                const prev = prevMap.get(curr.medication_code);
+                if (!prev) {
+                    // 추가된 약
+                    result.push({ ...curr, status: 'added' });
+                } else {
+                    // 비교
+                    const changes = [];
+                    if (parseFloat(curr.dosage) !== parseFloat(prev.dosage)) {
+                        changes.push({ field: 'dosage', from: prev.dosage, to: curr.dosage });
+                    }
+                    if (parseInt(curr.frequency) !== parseInt(prev.frequency)) {
+                        changes.push({ field: 'frequency', from: prev.frequency, to: curr.frequency });
+                    }
+                    if (parseInt(curr.duration) !== parseInt(prev.duration)) {
+                        changes.push({ field: 'duration', from: prev.duration, to: curr.duration });
+                    }
+                    
+                    if (changes.length > 0) {
+                        result.push({ ...curr, status: 'changed', changes });
+                    } else {
+                        result.push({ ...curr, status: 'same' });
+                    }
+                }
+            }
+            
+            // 중단된 약 (이전에 있었는데 현재 없음)
+            for (const prev of previous) {
+                if (!currCodes.has(prev.medication_code)) {
+                    result.push({ ...prev, status: 'removed' });
+                }
+            }
+            
+            return result;
+        }
+        
+        // 비교 모드 적용
+        function applyCompareMode() {
+            if (historyData.length === 0 || !currentMedications.length) return;
+            
+            const prevMeds = historyData[historyIndex].medications || [];
+            const compared = comparePrescriptions(currentMedications, prevMeds);
+            
+            // 테이블 다시 렌더링
+            renderComparedTable(compared);
+        }
+        
+        // 비교 결과 테이블 렌더링
+        function renderComparedTable(compared) {
+            const medList = document.getElementById('medicationList');
+            
+            // 상태별 정렬: 추가 > 변경 > 동일 > 중단
+            const order = { added: 0, changed: 1, same: 2, removed: 3 };
+            compared.sort((a, b) => order[a.status] - order[b.status]);
+            
+            medList.innerHTML = `
+                <table class="med-table">
+                    <thead>
+                        <tr>
+                            <th style="width:40px;"><input type="checkbox" id="checkAll" onchange="toggleAll(this)"></th>
+                            <th>약품명</th>
+                            <th>상태</th>
+                            <th>용량</th>
+                            <th>횟수</th>
+                            <th>일수</th>
+                        </tr>
+                    </thead>
+                    <tbody>
+                        ${compared.map(m => {
+                            const rowClass = 'row-' + m.status;
+                            const statusLabel = {
+                                added: '<span class="med-status status-added">🆕 추가</span>',
+                                removed: '<span class="med-status status-removed">❌ 중단</span>',
+                                changed: '<span class="med-status status-changed">🔄 변경</span>',
+                                same: '<span class="med-status status-same">✓ 동일</span>'
+                            }[m.status];
+                            
+                            // 변경된 필드 찾기
+                            const getChangeValue = (field, value) => {
+                                if (m.status !== 'changed' || !m.changes) return value || '-';
+                                const change = m.changes.find(c => c.field === field);
+                                if (change) {
+                                    return `<span class="change-from">${change.from || '-'}</span>` +
+                                           `<span class="change-arrow">→</span>` +
+                                           `<span class="change-to">${change.to || '-'}</span>`;
+                                }
+                                return value || '-';
+                            };
+                            
+                            const disabled = m.status === 'removed' ? 'disabled' : '';
+                            
+                            return `
+                                <tr class="${rowClass}" data-add-info="${escapeHtml(m.add_info || '')}">
+                                    <td><input type="checkbox" class="med-check" data-code="${m.medication_code}" ${disabled}></td>
+                                    <td>
+                                        <div class="med-name">${m.med_name || m.medication_code}</div>
+                                        <div class="med-code">${m.medication_code}</div>
+                                        ${m.add_info ? `<div style="font-size:0.75rem;color:#6b7280;">${escapeHtml(m.add_info)}</div>` : ''}
+                                    </td>
+                                    <td>${statusLabel}</td>
+                                    <td>${m.status === 'changed' ? getChangeValue('dosage', m.dosage) : (m.dosage || '-')}</td>
+                                    <td>${m.status === 'changed' ? getChangeValue('frequency', m.frequency) : (m.frequency || '-')}회</td>
+                                    <td>${m.status === 'changed' ? getChangeValue('duration', m.duration) : (m.duration || '-')}일</td>
+                                </tr>
+                            `;
+                        }).join('')}
+                    </tbody>
+                </table>
+            `;
+        }
+        
+        // 일반 테이블로 복원
+        function rerenderMedicationTable() {
+            if (!currentMedications.length) return;
+            
+            const medList = document.getElementById('medicationList');
+            medList.innerHTML = `
+                <table class="med-table">
+                    <thead>
+                        <tr>
+                            <th style="width:40px;"><input type="checkbox" id="checkAll" onchange="toggleAll(this)"></th>
+                            <th>약품명</th>
+                            <th>제형</th>
+                            <th>용량</th>
+                            <th>횟수</th>
+                            <th>일수</th>
+                        </tr>
+                    </thead>
+                    <tbody>
+                        ${currentMedications.map(m => `
+                            <tr data-add-info="${escapeHtml(m.add_info || '')}">
+                                <td><input type="checkbox" class="med-check" data-code="${m.medication_code}"></td>
+                                <td>
+                                    <div class="med-name">${m.med_name || m.medication_code}</div>
+                                    <div class="med-code">${m.medication_code}</div>
+                                    ${m.add_info ? `<div style="font-size:0.75rem;color:#6b7280;">${escapeHtml(m.add_info)}</div>` : ''}
+                                </td>
+                                <td>${m.formulation ? `<span class="med-form">${m.formulation}</span>` : '-'}</td>
+                                <td><span class="med-dosage">${m.dosage || '-'}</span></td>
+                                <td>${m.frequency || '-'}회</td>
+                                <td>${m.duration || '-'}일</td>
+                            </tr>
+                        `).join('')}
+                    </tbody>
+                </table>
+            `;
+        }
+        
         // 상세 초기화
         function clearDetail() {
             document.getElementById('detailHeader').style.display = 'none';
             document.getElementById('actionBar').style.display = 'none';
             document.getElementById('historySection').style.display = 'none';
+            document.getElementById('compareToggle').style.display = 'none';
+            document.getElementById('compareMode').checked = false;
+            document.getElementById('compareLegend').style.display = 'none';
             document.getElementById('medicationList').innerHTML = `
                 <div class="empty-state">
                     <div class="icon">👈</div>
@@ -665,8 +915,10 @@
             `;
             currentPrescriptionId = null;
             currentPatientCode = null;
+            currentMedications = [];
             historyData = [];
             historyIndex = 0;
+            compareMode = false;
         }
         
         // 전체 선택 토글
