Doxycycline

Siadocin Doxycycline 100 mg Antibiotic Capsule

Creator: Supatcheree A., Pharmacist
Published: 2026-08-12

80.00 ฿ In Stock

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Siadocin is a Tetracycline-class antibiotic containing Doxycycline 100 mg, used for inflammatory acne, respiratory infections, and sexually transmitted infections.

💊 Active ingredient: Doxycycline 100 mg
⏱️ Directions: 1-2 times daily as directed, complete the full course
🍽️ Condition: take with or after food, drink plenty of water, do not lie down right after
📦 Pack: 1 box (10 capsules)
⚡ Highlights: broad-spectrum, treats acne and infections, short course
🌡️ Storage: room temperature, away from sunlight and moisture

ตัวเลือก: จำนวน 10 แคปซูล

จำนวน 10 แคปซูล

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การจัดส่งสินค้า

จัดส่งสินค้าอย่างเป็นส่วนตัวภายในประเทศไทย โดยบรรจุภัณฑ์ไม่ระบุรายละเอียดสินค้า ลูกค้าสามารถตรวจสอบเงื่อนไขการจัดส่งและการคืนสินค้าได้ตามนโยบายของร้าน หากมีข้อสงสัยสามารถติดต่อทีมงานเพื่อขอข้อมูลเพิ่มเติม

What is Siadocin?
Siadocin is a Tetracycline-class antibiotic containing Doxycycline 100mg, used for inflamed acne, respiratory infections, and certain sexually transmitted infections by inhibiting bacterial protein synthesis. Take 1-2 times daily as directed by a doctor or pharmacist and complete the full course. Take with food, drink plenty of water, and avoid lying down right after. Made by Siam Bheasach, boxes of 10 capsules.
🛒 1 box (10 capsules) · Authentic · Fast delivery in 24h. Intimo Life — Consult a doctor or pharmacist before use

Product Description

Doxycycline 100 mg is a broad-spectrum tetracycline antibiotic used for inflammatory acne, respiratory tract infections, and sexually transmitted infections. It works by binding to the bacterial 30S ribosomal subunit, blocking protein synthesis and stopping bacterial growth (bacteriostatic mechanism). Siadocin contains 100 mg Doxycycline HCl per capsule, manufactured by Siam Bheasach Co., Ltd. in Bangkok (Reg. No. 1A 145/39), approved by Thailand's Food and Drug Administration.

📊 Clinical evidence: Doxycycline reduces inflammatory acne lesions by 50–60% within 12 weeks (PubMed/JAAD). It is a first-line treatment for Chlamydia (most reported STI in Thailand, DDC 2023), Syphilis in penicillin-allergic patients, atypical pneumonia (Mycoplasma, Chlamydophila), and Lyme disease.

🧬 Mechanism: 30S ribosome inhibitor → bacteriostatic
💊 Strength: 100 mg Doxycycline HCl per capsule
🏭 Manufacturer: Siam Bheasach Co., Ltd., Bangkok | Reg. 1A 145/39
📦 Pack size: 10 capsules per box | Store below 30°C, away from light

Medically reviewed by

Supatcheree A., Pharmacist | แหล่งข้อมูล: NHS UK, StatPearls (NCBI), MedlinePlus, PubMed, DDC Thailand

Last reviewed: 2026-06-24

About Siadocin

How to Use Doxycycline 100 mg

Doxycycline 100 mg should always be used as directed by a doctor or pharmacist. General adult dosages are as follows:

Common Dosages

Inflammatory acne: 100 mg once daily for 6–12 weeks
Respiratory tract infections: 100 mg once or twice daily as prescribed
STDs (Chlamydia, Syphilis): 100 mg twice daily for 7–14 days

How to Take

Take with or after food to reduce nausea
Drink at least 240 ml of water with each dose
Do not lie down within 30 minutes of taking (prevents esophageal ulceration)
Avoid milk, calcium supplements, and antacids within 2 hours before or after dosing (chelation reduces absorption)
Avoid prolonged sun exposure; use SPF 30+ sunscreen while on treatment

⚠️ Complete the full course even if symptoms improve.

Indications & Uses

Doxycycline 100 mg is approved for the following indications:

1. Inflammatory Acne

An effective oral antibiotic for acne that reduces Cutibacterium acnes and suppresses inflammation simultaneously. Indicated for moderate-to-severe inflammatory acne unresponsive to topical treatments.

2. Respiratory Tract Infections

Treats atypical pneumonia (Mycoplasma pneumoniae, Chlamydophila pneumoniae) and chronic bronchitis.

3. Sexually Transmitted Infections (STI)

First-line treatment for Chlamydia, gonorrhea (non-penicillinase-producing strains), and syphilis in penicillin-allergic patients.

4. Other Infections

Lyme disease (tick-borne)
Rickettsia infections
Malaria prophylaxis

Side Effects & Precautions

Common Side Effects

Nausea, vomiting, or stomach upset (reduced by taking with food)
Photosensitivity — avoid prolonged sun exposure
Diarrhea
Headache, dizziness
Skin rash

Less Common but Important

Esophageal ulceration — prevented by drinking plenty of water and not lying down
Vaginal yeast infection
Pseudomembranous colitis (rare)

Contraindications

Children under 8 years (risk of tooth discoloration and bone effects)
Pregnancy and breastfeeding
Known hypersensitivity to tetracyclines

Drug Interactions

Doxycycline has clinically important interactions with several medications and substances.

Substances That Reduce Doxycycline Absorption

Antacids (aluminum/magnesium) — space at least 2 hours apart
Iron supplements / Calcium — chelation significantly reduces absorption
Milk / Dairy — high calcium; take 2 hours apart
Bismuth subsalicylate

Other Key Interactions

Warfarin — may enhance anticoagulant effect; monitor INR closely
Oral contraceptives — may reduce efficacy; use backup contraception
Penicillins — avoid combining (bacteriostatic vs bactericidal antagonism)
Retinoids (e.g. isotretinoin) — increased risk of intracranial hypertension

Comparing Oral Antibiotics

Oral antibiotics differ in spectrum and indication. Here is a quick comparison:

Siadocin — Doxycycline 100 mg

Best for: inflammatory acne, atypical pneumonia, STIs (Chlamydia, syphilis), Lyme disease | Tetracycline class | bacteriostatic

AMK (Amoxicillin) — Gram-positive spectrum

Best for: respiratory infections, otitis media, H. pylori | Penicillin class | bactericidal

Augmentin (Amoxicillin+Clavulanate) — broader than Amoxicillin

Best for: beta-lactamase-producing organisms; combines amoxicillin with clavulanate inhibitor

Cobay-500 (Ciprofloxacin) — Gram-negative spectrum

Best for: UTI, bacterial diarrhea, intra-abdominal infections | Fluoroquinolone | bactericidal

Cifloxin (Ciprofloxacin) — Gram-negative spectrum

Same active ingredient as Cobay-500; alternative brand for urinary and GI tract infections

Metrolex (Metronidazole) — Anaerobes & Parasites

Best for: anaerobic infections, Trichomoniasis, Giardia, bacterial vaginosis | bactericidal vs anaerobes

Summary: Siadocin (Doxycycline) is the first choice for oral acne treatment and Chlamydia/Syphilis STIs. Amoxicillin covers Gram-positive infections; Ciprofloxacin targets Gram-negative organisms.

Manufacturer & Registration

Manufacturer

Siam Bheasach Co., Ltd.
Bangkok, Thailand

Drug Registration

Registration No.: 1A 145/39

Dosage Form

Form: Capsule
Strength: 100 mg Doxycycline HCl per capsule
Pack size: 10 capsules per box

Storage

Store in a dry place below 30°C, away from direct sunlight. Keep out of reach of children.

Related Collections

Explore related medications and products in the following collections:

Doxycycline — All products containing Doxycycline
Antibiotics — Complete range of antibacterial medications
Acne Treatments — Oral and topical acne medications

Where to Buy Siadocin

Buy Online at Intimo Life

Intimo Life stocks authentic Siadocin (Doxycycline 100 mg) with nationwide delivery across Thailand. Orders are shipped in plain, discreet packaging—no product name shown. Available to order 24/7.

⚠️ ข้อจำกัดความรับผิดชอบ

เนื้อหาในบทความนี้มีจุดประสงค์เพื่อให้ความรู้ทั่วไปเท่านั้น ไม่ได้มีเจตนาทดแทนคำแนะนำ การวินิจฉัย หรือการรักษาจากแพทย์หรือเภสัชกรผู้เชี่ยวชาญ หากมีข้อสงสัยเกี่ยวกับอาการหรือการใช้ยา ควรปรึกษาแพทย์หรือเภสัชกรก่อนเสมอ

References

Frequently Asked Questions

Doxycycline 100 mg treats inflammatory acne, atypical respiratory infections (Mycoplasma, Chlamydophila pneumoniae), sexually transmitted infections (Chlamydia, Syphilis), Lyme disease, and is used for malaria prophylaxis. It is a broad-spectrum tetracycline antibiotic that inhibits bacterial growth.

Take Doxycycline with or right after food to minimize nausea. Always drink at least 240 ml of water with each dose. Do not lie down for at least 30 minutes after taking.

Common side effects include nausea, increased sun sensitivity (photosensitivity), diarrhea, and headache. A less common but important risk is esophageal ulceration, prevented by drinking plenty of water and staying upright after taking.

Avoid milk and dairy products within 2 hours before or after taking Doxycycline. Calcium in dairy forms a chelate complex with the drug, significantly reducing its absorption into the bloodstream.

Most people see a reduction in inflammatory acne lesions within 4–6 weeks, with maximum benefit around 12 weeks. Studies report 50–60% lesion reduction at 12 weeks. It is typically combined with topical treatments as recommended by a dermatologist.

Doxycycline is contraindicated in children under 8 years (risk of permanent tooth discoloration), pregnant women, breastfeeding mothers, and anyone with a known allergy to tetracyclines.

Siadocin is the brand name for Doxycycline 100 mg manufactured by Siam Bheasach Co., Ltd., an FDA-approved Thai pharmaceutical company. The active ingredient and dosage strength are identical to generic Doxycycline.

Key interactions include: Warfarin (enhanced anticoagulation — monitor INR), oral contraceptives (reduced efficacy — use backup), retinoids like isotretinoin (risk of intracranial hypertension), and antacids/iron supplements (reduced absorption).

Oral Doxycycline works systemically (throughout the body), making it suitable for moderate-to-severe or widespread inflammatory acne. Topical antibiotics (e.g. Clindamycin gel) act locally and are better for mild-to-moderate acne. Dermatologists often combine both for optimal results.