Classification of drugs part 3

Anaesthetic Agents

Anaesthetics induce an absence of sensation or pain, categorized into local and general anesthetics. Local anaesthetics block pain signals from peripheral nerves to the central nervous system without loss of consciousness, while general anesthetics depress the CNS to induce unconsciousness.

Local Anaesthetics

Common uses for local anaesthetics include:

  • Dental procedures (topical or injected)

  • Childbirth pain relief (spinal, epidural, IV)

  • Treatment for sunburn, hemorrhoids, and skin irritations (topical).Examples include lidocaine and procaine.

General Anaesthetics

General anaesthetics are classified by their route of administration: inhalation or intravenous (IV). IV anaesthesia typically results in quicker and smoother onset compared to inhaled agents. A combination of various agents is commonly used to minimize side effects and maximize effectiveness. Examples include isoflurane (inhalation) and propofol (IV).

Anti-infectives

Infections occur when pathogenic microorganisms invade body tissues. Anti-infectives target diseases caused by microorganisms, including bacteria, viruses, and fungi.

Antibacterials

Antibacterials manage bacterial infections, categorized into:

  • Bactericidal: kill bacteria

  • Bacteriostatic: inhibit bacterial growth.

Examples of Antibacterials

  • Penicillins: Amoxicillin

  • Cephalosporins: Cefuroxime

  • Quinolones: Ciprofloxacin

  • Aminoglycosides: Gentamycin

  • Macrolides: Clarithromycin

  • Tetracyclines: Doxycycline

  • Sulphonamides: Sulfamethoxazole

  • Trimethoprim.

Sites of Action of Antibacterial Drugs

  • Cell wall: Penicillins, cephalosporins

  • Protein synthesis: Aminoglycosides, macrolides, tetracyclines

  • Nucleic acids: Quinolones

  • Folic acid synthesis: Sulphonamides, trimethoprim.

Antivirals

Antivirals prevent viral replication; for effective treatment, they must stop viral reproduction while sparing healthy cells. Examples include nelfinavir (Viracept®) for HIV and hepatitis C, and acyclovir (Zovirax®).

Antifungals

Used to treat fungal infections, antifungal drugs are generally fungicidal, destroying the fungal cell by compromising its cell permeability. Common target sites include moist body areas (between toes, in the genital area).

Fungal Infections

Common infections such as candidiasis (Caused by Candida yeast) escalate under conditions like humid weather, poor hygiene, and weakened immune systems. Symptoms can vary based on the infection's location, including rashes, discharges, and thrush in the mouth.

Treatment for Candidiasis

Topical treatments include antifungal creams (e.g., miconazole, ketoconazole). Vaginal candidiasis uses antifungals administrated as creams or orally (e.g., fluconazole). Keeping affected areas dry aids in treatment and prevention of recurrence.

Dermatophytoses

Dermatophyte infections (ringworm) require keratin for nutrition, often affecting skin, hair, and nails. Symptoms include itching and scaling.

Antineoplastics

In oncology, antineoplastics inhibit cancer cell growth and accompany other treatments (surgery, radiation). They often have severe side effects like immunosuppression and anemia.

Common Antineoplastics

  • Antimetabolites: Fluorouracil

  • Plant Alkaloids: Vincristine

  • Antitumor antibiotics: Doxorubicin.

Gastrointestinal Agents

Diarrhea results from infection or other factors affecting absorption. Antidiarrheal drugs (e.g., loperamide) help manage symptoms. Nausea and vomiting are treated with antiemetics like metoclopramide.

Hormonal Agents

The thyroid gland regulates metabolism via hormones T4 and T3. Disorders like hyperthyroidism and hypothyroidism affect metabolic rates and require respective treatments.

Antidiabetic Agents

Diabetes mellitus involves insulin issues; type I is managed with quick-acting insulins, while type II may involve oral hypoglycemics (e.g., metformin).

Musculoskeletal Agents

Conditions like rheumatoid arthritis and gout are typically treated with NSAIDs and drug therapies tailored to affect inflammation and uric acid levels.

Neurological Agents

Conditions like Parkinson’s and epilepsy require varied drug therapies, including dopaminergic agents and anticonvulsants.

Psychotropic Agents

Treatments for anxiety and mood disorders often involve various antidepressants and antipsychotic medications tailored to patient needs.

Conclusion

Pharmacological treatments span numerous conditions, focusing on alleviating symptoms and improving patient health outcomes.