Suffix Class Example
AFIL erectile dysfunction sildenafil
ARTRAN angiotensin receptor blocker losartan
AZOSIN alpha 1 blocker prazosin
CAINE local anesthetic lidocaine
CILLIN penicillin-like antibacterial amoxicillin
CONAZOLE antifungal ketoconazole
CYCLINE tetracycline-like antibiotic tetracycline
DRONATE bisphosphonate etidronate
FLOXACIN fluoroquinolone ciprofloxacin
FUNGIN antifungal caspofungin
IDE sulfonylureas tolbutamide
INE antihistamine fexofenadine
IPINE calcium channel blocker nifedipine
MYCIN or MICIN antibacterial or anticancer erythromycin
NAVIR protease inhibitor antiviral ritonavir
OLOL beta blocker propranolol
ONE glucocorticoids corticosterone
PAM or LAM benzodiazepine diazepam or midazolam
PARIN heparin-like anticoagulant heparin
PRAZOLE proton pump inhibitor omeprazole
PRIL ACE inhibitor captopril
QUINE antimalarial primaquine
RUDIN lepirudin-like anticoagulant lepirudin
SETRON serotonin blocker alosetron
STATIN HMG coA reductase inhibitor atorvastatin
TRIPTAN serotonin agonist sumatriptan
Also, here's a common classification scheme for drugs and virtually any drug you find is one of these:
Autonomic Drugs
Cholinoceptor-Activating and Cholinesterase-Inhibiting Drugs
Cholinoceptor-Blocking Drugs
Adrenoceptor-Acivating and Other Sympathomimetic Drugs
Adrenoceptor Antagonist Drugs
Cardiovascular-Renal drugs
Antihypertensive Agents
Vasodilators and Drugs for Treatment of Angina Pectoris
Drugs Used in Heart Failure
Antiarrhythmics
Diuretic Agents
Drugs Acting on Smooth Muscle
Histamine, Serotonin and the Ergot Alkaloids
Vasoactive Peptides
The Eicosanoids: Prostaglandins, Thromboxanes, Leukotrienes, and Related Compounds
Nitric Oxide, Donor, and Inhibitors
Drugs Used in Asthma
Drugs Acting in the Central Nervous System
Sedative-Hypnotic Drugs
The Alcohols
Antiseizure Drugs
General Anesthetics
Local Anesthetics
Pharmacologic Management of Parkinsonism and Other Movement Disorders
Antipsychotic Agents and Lithium
Antidepressant Agents
Opioid Analgesics and Antagonists
Drugs of Abuse
Drugs used to Treat Diseases of the Blood, Inflammation and Gout
Agents Used in Anemias; Hematopoetic Growth Factors
Drugs Used in Disorders of Coagulation
Agents Used in Hyperlipidemia
NSAIDs, DMARDs, Nonopioid Analgesics, and Drugs Used in Gout
Endocrine Drugs
Hypothalamic and Pituitary Hormones
Thyroid and Antithyroid Drugs
Adrenocorticoids and Adrenocortical Antagonists
The Gonadal Hormones and inhibitors
Pancreatic Hormones and Antidiabetic Drugs
Agents That Affect Bone Mineral Homeostasis
Chemotherapeutic Drugs
Antibacterials
Disinfectants, Antiseptics, and Sterilants
Antimycobacterials
Antifungals
Antiprotozoals
Anthelmintics
Antivirals
Anticancer drugs
Immunosuppressants
Drugs Affecting Other Systems
Gastrointestinal and Antiemetic Drugs
Botanicals and Nutritional Supplements
Toxic Compounds