Clinical features Diagnosis management with dosage timing and duration of common diseases in opd with images if possible

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Researching clinical features, diagnosis, and management of common OPD diseases with images across multiple conditions simultaneously.

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Harrison's Principles of Internal Medicine, Twenty First Edition

Page 8106

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common OPD diseases clinical diagnosis management

Dermnetnz

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The initial results are too narrow. Let me run comprehensive parallel searches across the most common OPD conditions.

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upper respiratory tract infection URTI diagnosis treatment dosage duration

Harrison's Principles of Internal Medicine, Twenty First Edition

Page 1054

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hypertension diagnosis management antihypertensive drug dosage outpatient

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type 2 diabetes mellitus diagnosis management metformin dosage outpatient

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community acquired pneumonia clinical features diagnosis antibiotic treatment dosage

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urinary tract infection UTI diagnosis treatment antibiotic duration dosage

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peptic ulcer disease GERD gastritis diagnosis treatment PPI dosage

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asthma bronchial clinical features diagnosis management inhaler salbutamol dosage

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acute diarrhea gastroenteritis diagnosis treatment ORS antibiotic dosage

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hypertension blood pressure measurement clinical

Management of Elevated Blood Pressure and Hypertension

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pneumonia chest X-ray consolidation

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diabetes mellitus type 2 clinical features

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asthma bronchial wheeze lung

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I now have sufficient retrieved content and will complete the rest from evidence-based knowledge (Harrison's, WHO, JNC, GINA, ADA guidelines). Here is a comprehensive OPD reference:

🏥 Common OPD Diseases: Clinical Features, Diagnosis & Management

1. 🤧 Upper Respiratory Tract Infection (URTI)

Clinical Features

Rhinorrhea, nasal congestion, sneezing
Sore throat, mild fever (≤38.5°C), malaise
Mild cough, hoarseness
Duration: 5–10 days (self-limiting, viral)

Diagnosis

Clinical — no investigations routinely needed
Throat swab culture if bacterial (Group A Streptococcus) suspected
Rapid antigen test for Strep if tonsillar exudates + fever

Management

Symptom	Drug	Dose	Duration
Fever / pain	Paracetamol	500–1000 mg PO TDS–QID	3–5 days
Fever / pain	Ibuprofen	400 mg PO TDS with food	3–5 days
Nasal congestion	Pseudoephedrine	60 mg PO BD-TDS	≤5 days
Nasal congestion	Oxymetazoline nasal spray	2 sprays each nostril BD	≤5 days
Cough	Dextromethorphan	15–30 mg PO TDS	3–5 days
Cough	Salbutamol syrup	2 mg PO TDS	3–5 days
Bacterial URTI / Strep pharyngitis	Amoxicillin	500 mg PO TDS	10 days
Penicillin allergy	Azithromycin	500 mg Day 1, then 250 mg OD	5 days

⚠️ Antibiotics are NOT indicated for viral URTI. Reserve for confirmed bacterial infection. (Harrison's, p. 1054)

2. 🫁 Bronchial Asthma

Clinical Features

Episodic wheeze, breathlessness, chest tightness
Nocturnal / early morning cough (classic)
Symptoms triggered by cold air, exercise, allergens, infections
Hyperresonance on percussion; prolonged expiration

Diagnosis

Spirometry: FEV₁/FVC < 0.70, reversibility ≥12% & ≥200 mL after bronchodilator
Peak Expiratory Flow Rate (PEFR): diurnal variation >20%
CXR: hyperinflation (in acute attack)

Management (GINA Guidelines)

Stepwise approach:

Step	Controller	Reliever
Step 1 (mild intermittent)	None needed	SABA (Salbutamol) PRN
Step 2 (mild persistent)	Low-dose ICS (Beclomethasone 100–200 mcg BD)	SABA PRN
Step 3 (moderate persistent)	Low-dose ICS + LABA (Formoterol)	SABA PRN
Step 4 (severe persistent)	Medium/high ICS + LABA ± LAMA	SABA PRN

Drug	Dose	Timing
Salbutamol MDI (reliever)	100–200 mcg (1–2 puffs)	PRN, max 4 puffs/day
Salbutamol nebulization (acute)	2.5 mg in 2.5 mL NS	Q20 min × 3, then Q4–6h
Beclomethasone inhaler	100–400 mcg BD	Ongoing (controller)
Prednisolone (acute)	40–60 mg PO OD	5–7 days
Montelukast (add-on)	10 mg PO OD at night	Long-term

3. 🫀 Hypertension

Clinical Features

Usually asymptomatic ("silent killer")
Headache (occipital, morning), dizziness, epistaxis in severe cases
Signs of end-organ damage: blurred vision, chest pain, shortness of breath, hematuria

Diagnosis

Office BP ≥140/90 mmHg on ≥2 occasions

Classification	Systolic	Diastolic
Normal	<120	<80
Elevated	120–129	<80
Stage 1 HTN	130–139	80–89
Stage 2 HTN	≥140	≥90
Hypertensive crisis	>180	>120

ABPM thresholds (ESC 2023):

≥130/80 mmHg (24-hr average)
≥135/85 mmHg (daytime)
≥120/70 mmHg (night-time)

Ambulatory Blood Pressure Measurement steps & diagnostic thresholds (ESC, p. 22)

Workup: ECG, renal function (serum creatinine, eGFR), urinalysis, fasting glucose, lipid panel, fundoscopy

Management

Drug Class	Example	Dose	Frequency
First-line: ACE Inhibitor	Enalapril	5–40 mg	OD–BD
ARB	Losartan	50–100 mg	OD
CCB	Amlodipine	5–10 mg	OD
Thiazide diuretic	Hydrochlorothiazide	12.5–25 mg	OD
Beta-blocker (if HF/IHD)	Atenolol	25–100 mg	OD
Combination	Amlodipine + Valsartan	5/80 mg – 10/160 mg	OD

Target BP: <130/80 mmHg (most patients), <140/90 in elderly >65 yrs
Lifestyle: low-salt diet (<5 g/day), DASH diet, aerobic exercise 30 min/day, weight loss, no smoking

4. 🩸 Type 2 Diabetes Mellitus

Clinical Features

Classic triad: Polyuria, Polydipsia, Polyphagia
Unexplained weight loss, fatigue, blurred vision
Recurrent infections (skin, UTI, candidiasis)
Delayed wound healing, paresthesia (neuropathy)

Diagnosis (ADA 2024)

Criterion	Threshold
Fasting plasma glucose	≥126 mg/dL (7.0 mmol/L)
2-hr OGTT	≥200 mg/dL (11.1 mmol/L)
HbA1c	≥6.5% (48 mmol/mol)
Random glucose + symptoms	≥200 mg/dL

Requires 2 abnormal tests on separate days (unless unequivocal hyperglycemia with symptoms)

Management

Drug	Dose	Timing	Duration
Metformin (1st-line)	500 mg OD initially → 1000 mg BD (max 2550 mg/day)	With meals	Lifelong
Glibenclamide (SU)	2.5–15 mg	Before breakfast	Ongoing
Glipizide	5–20 mg	BD before meals	Ongoing
Sitagliptin (DPP-4i)	100 mg OD	Any time	Ongoing
Empagliflozin (SGLT-2i)	10–25 mg OD	Morning	Ongoing
Insulin (if uncontrolled)	0.1–0.3 U/kg/day (basal)	Bedtime	Ongoing

HbA1c target: <7% (most patients)
Monitoring: HbA1c every 3 months until target, then every 6 months; annual renal function, lipids, fundoscopy, foot exam
Diet: low glycemic index, reduce refined carbs

5. 🔥 Peptic Ulcer Disease (PUD) / GERD / Gastritis

Clinical Features

Feature	PUD	GERD
Pain	Epigastric, burning	Heartburn, retrosternal
Timing	PU: relieved by food (DU), worsened by food (GU)	After meals, lying down
Associated	Nausea, bloating	Regurgitation, sour taste
Red flags	Melena, hematemesis, weight loss	Dysphagia, weight loss

Diagnosis

OGD scopy (endoscopy) — gold standard for ulcers
H. pylori: Urea breath test, stool antigen test, biopsy urease test
Upper GI barium series (if endoscopy unavailable)
CXR / US abdomen to rule out perforation / other causes

Management

Drug	Dose	Timing	Duration
Omeprazole (PPI)	20–40 mg	30 min before breakfast	4–8 weeks (ulcer); lifelong (GERD)
Pantoprazole	40 mg OD	Before breakfast	4–8 weeks
Rabeprazole	20 mg OD	Before breakfast	4–8 weeks
Antacid (Mg-Al hydroxide)	10–20 mL	After meals & at bedtime	PRN
Sucralfate	1 g QID	1 hr before meals	4–8 weeks
H. pylori eradication (Triple therapy):			14 days
Amoxicillin	1 g BD	With PPI	14 days
Clarithromycin	500 mg BD	With PPI	14 days
Omeprazole	20–40 mg BD	Before meals	14 days
Metronidazole (if Amox allergy)	500 mg BD	With PPI	14 days

6. 🧫 Urinary Tract Infection (UTI)

Clinical Features

Lower UTI (Cystitis): Dysuria, frequency, urgency, suprapubic pain, cloudy/malodorous urine
Upper UTI (Pyelonephritis): Fever, rigors, loin/flank pain, nausea/vomiting + lower UTI symptoms

Diagnosis

Urine dipstick: Nitrites +, Leukocyte esterase + (quick screen)
Urine microscopy: >10 WBC/hpf (pyuria)
Urine culture & sensitivity — gold standard (>10⁵ CFU/mL)

Management

Condition	Drug	Dose	Duration
Uncomplicated cystitis (women)	Nitrofurantoin	100 mg BD	5 days
Uncomplicated cystitis	Trimethoprim	200 mg BD	7 days
Uncomplicated cystitis	Co-trimoxazole	960 mg BD	3 days
Uncomplicated cystitis	Ciprofloxacin	250 mg BD	3 days
Pyelonephritis (mild-mod)	Ciprofloxacin	500 mg BD	7–14 days
Pyelonephritis	Ceftriaxone (IV)	1–2 g OD	5–7 days then oral
Complicated / recurrent UTI	Co-amoxiclav	625 mg TDS	7–10 days
UTI in pregnancy	Cefalexin	500 mg QID	7 days

⚠️ Avoid fluoroquinolones in pregnancy. Always send urine C&S before starting antibiotics.

7. 🫧 Community-Acquired Pneumonia (CAP)

Clinical Features

Fever, rigors, productive cough (rust-colored sputum in lobar pneumonia)
Pleuritic chest pain, dyspnea, tachypnea
Signs: Dullness to percussion, bronchial breathing, crepitations, tactile vocal fremitus ↑

Diagnosis

CXR: Lobar / segmental consolidation, interstitial pattern
CBC: Leukocytosis (bacterial), leukopenia (viral/severe)
Sputum Gram stain & culture
Blood cultures (if hospitalized or severe)
Procalcitonin, CRP
Severity scoring: CURB-65 (Confusion, Urea >7, RR ≥30, BP <90/60, Age ≥65) — score ≥2 = hospitalize

Management

Setting	Drug	Dose	Duration
Outpatient, no comorbidities	Amoxicillin	1 g TDS	5–7 days
Outpatient, atypicals suspected	Azithromycin	500 mg OD Day 1, then 250 mg OD	5 days
Outpatient, comorbidities	Co-amoxiclav + Azithromycin	625 mg TDS + 500 mg OD	5–7 days
Outpatient (alternative)	Doxycycline	100 mg BD	5–7 days
Hospital, non-ICU	Co-amoxiclav IV + Azithromycin PO	1.2 g TDS + 500 mg OD	5–7 days
Supportive	Paracetamol, O₂, hydration	—	As needed

8. 💧 Acute Diarrhea / Gastroenteritis

Clinical Features

≥3 loose stools/day, abdominal cramps, nausea/vomiting
Fever (suggests bacterial/inflammatory)
Dehydration signs: dry mouth, sunken eyes, reduced skin turgor, oliguria, tachycardia
Blood in stool → dysentery (Shigella, Entamoeba, Campylobacter)

Diagnosis

Clinical assessment (severity of dehydration)
Stool microscopy, culture in severe/prolonged cases
CBC, electrolytes, renal function if severe dehydration

Management

Treatment	Details
Oral Rehydration Solution (ORS)	200–400 mL after each loose stool (adults)
IV Fluids (if severe)	Normal saline / Ringer's lactate
Zinc (children)	20 mg OD for 10–14 days
Loperamide (adults only)	4 mg then 2 mg after each stool (max 16 mg/day)
Bacterial dysentery (Shigella)	Ciprofloxacin 500 mg BD × 3 days
Campylobacter	Azithromycin 500 mg OD × 3 days
Amoebiasis	Metronidazole 800 mg TDS × 5–10 days
Giardiasis	Metronidazole 400 mg TDS × 5–7 days
Cholera	Doxycycline 300 mg single dose (adults)

⚠️ Antibiotics are not routinely indicated for viral gastroenteritis (most acute cases).

9. 🤒 Typhoid Fever

Clinical Features

Stepladder fever (rising daily over 1 week)
Relative bradycardia (pulse-temperature dissociation)
Rose spots (faint, salmon-colored macules on abdomen)
Hepatosplenomegaly, coated tongue
Constipation early → diarrhea late; "pea-soup" stools

Diagnosis

Widal test: O antigen ≥1:160, H antigen ≥1:160 (supportive, not definitive)
Blood culture (gold standard, positive in 1st week)
Stool / urine culture (2nd–3rd week)
CBC: leukopenia, relative lymphocytosis, thrombocytopenia

Management

Drug	Dose	Duration
Ciprofloxacin (1st-line in endemic areas)	500 mg BD	10–14 days
Azithromycin (if fluoroquinolone-resistant)	1 g OD (or 500 mg OD)	7 days
Ceftriaxone (severe/MDR typhoid)	2 g IV OD	10–14 days
Chloramphenicol (historical)	500 mg QID	14 days
Paracetamol (antipyretic)	500–1000 mg TDS–QID	As needed

10. 🦠 Skin Infections (Impetigo / Cellulitis / Tinea)

Clinical Features

Condition	Features
Impetigo	Honey-crusted vesicles, golden lesions, face/limbs
Cellulitis	Warm, red, swollen, tender skin; fever; spreading erythema
Tinea (Ringworm)	Circular, scaly, pruritic plaques with central clearing
Scabies	Nocturnal pruritus, burrows in finger webs, wrists

Management

Condition	Drug	Dose	Duration
Impetigo (localized)	Mupirocin 2% ointment	TDS topically	5–7 days
Impetigo (extensive)	Flucloxacillin	500 mg QID	7 days
Cellulitis	Co-amoxiclav	625 mg TDS	5–7 days
Cellulitis (severe)	Flucloxacillin IV	1–2 g QID	5–10 days
Tinea corporis/cruris	Clotrimazole 1% cream	BD topically	2–4 weeks
Tinea capitis	Griseofulvin	10–20 mg/kg/day OD	6–8 weeks
Tinea unguium	Terbinafine	250 mg OD	6 wks (fingernails), 12 wks (toenails)
Scabies	Permethrin 5% cream	Apply whole body overnight	Repeat in 1 week

📋 Quick OPD Reference Summary Table

Disease	Key Symptom	Key Investigation	1st-Line Drug	Duration
URTI	Rhinorrhea, sore throat	Clinical	Paracetamol / Ibuprofen	3–5 days
Strep Pharyngitis	Exudative tonsillitis, fever	Rapid Strep test	Amoxicillin 500 mg TDS	10 days
Asthma	Wheeze, dyspnea, nocturnal cough	Spirometry	Salbutamol + ICS	Ongoing
Hypertension	Headache or asymptomatic	BP measurement, ECG	Amlodipine 5 mg OD	Lifelong
T2DM	Polyuria, polydipsia	FPG / HbA1c	Metformin 500→2000 mg/day	Lifelong
GERD/PUD	Heartburn, epigastric pain	OGD, H. pylori test	Omeprazole 20–40 mg OD	4–8 wks
UTI (cystitis)	Dysuria, frequency	Urine dipstick / C&S	Nitrofurantoin 100 mg BD	5 days
CAP	Fever, cough, consolidation	CXR, CBC	Amoxicillin 1 g TDS	5–7 days
Acute diarrhea	Loose stools, cramps	Stool MC&S (if prolonged)	ORS + Zinc	3–5 days
Typhoid	Stepladder fever, bradycardia	Blood culture	Ciprofloxacin 500 mg BD	10–14 days
Cellulitis	Warm red swollen skin	Clinical + CBC	Co-amoxiclav 625 mg TDS	5–7 days
Tinea	Circular scaly ring lesion	KOH scraping	Clotrimazole cream BD	2–4 weeks

Key OD/BD/TDS/QID definitions: OD = once daily | BD = twice daily | TDS = three times daily | QID = four times daily | PRN = as needed

📌 Disclaimer: Dosages listed are standard adult doses for non-pregnant patients with normal renal/hepatic function. Always adjust for age, weight, renal function, drug allergies, and local resistance patterns. Follow local antibiotic stewardship guidelines.

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