Handwritten medical study notes on "Bronchodilators Pharmacology" for MBBS 2nd year exams, on lined paper with a slightly yellow/cream tint, written in blue and black ink with red and green highlights. The notes include: Title at top: "BRONCHODILATORS PHARMACOLOGY" underlined in red Section 1 (blue heading, underlined): "CLASSIFICATION" Three numbered groups: 1. β2-Adrenergic Agonists (SABAs & LABAs) 2. Anticholinergics (Muscarinic antagonists) 3. Methylxanthines (Theophylline, Aminophylline) Section 2 (blue heading): "β2-AGONISTS" Mechanism: β2 receptor → ↑cAMP → PKA activation → smooth muscle relaxation SABAs: Salbutamol (albuterol), Terbutaline — onset 5-15 min, duration 4-6h LABAs: Salmeterol, Formoterol — duration ~12h Uses: Acute bronchospasm, Exercise-induced asthma ADRs: Tachycardia, tremor, hypokalemia, tachyphylaxis Section 3 (blue heading): "ANTICHOLINERGICS" Mechanism: Block M3 muscarinic receptors → ↓bronchomotor tone → bronchodilation SAMA: Ipratropium bromide — onset 15-20 min, preferred in COPD LAMA: Tiotropium — once daily, 24h duration ADRs: Dry mouth, urinary retention, blurred vision, constipation Section 4 (blue heading): "METHYLXANTHINES" Mechanism: Inhibit phosphodiesterase → ↑cAMP; Adenosine receptor antagonism Drugs: Theophylline (oral), Aminophylline (IV = theophylline + ethylenediamine) Narrow therapeutic index! TDM needed — therapeutic range 10-20 mcg/mL ADRs: N/V, tachycardia, seizures, arrhythmias (toxicity) Drug interaction: Erythromycin/Ciprofloxacin ↑ levels Small box (red border) labeled "EXAM TIPS": ★ Drug of choice acute severe asthma = Salbutamol nebulization ★ COPD 1st line = LAMA (Tiotropium) ★ Aminophylline IV = emergency bronchospasm ★ Salmeterol NEVER used as monotherapy in asthma Neat handwriting style, multiple colors, arrows connecting concepts, small star bullets, realistic notebook paper look