Doxycycline, a broad-spectrum antibiotic, was first introduced in 1967. It is used to treat various bacterial infections, including respiratory, skin, and urinary tract infections. Lactobacillus, a probiotic, is used to restore healthy gut flora, especially after antibiotic treatments. The combination of doxycycline and Lactobacillus helps prevent gastrointestinal side effects like diarrhoea, which are commonly associated with antibiotic therapy.

The Doxycycline and Lactobacillus combination is commonly used for:

1. Treatment of bacterial infections, such as:
   1. Respiratory tract infections (e.g., pneumonia, bronchitis)
   2. Skin infections (e.g., acne, rosacea)
   3. Genitourinary infections (e.g., urinary tract infections, chlamydia)
   4. Tick-borne diseases (e.g., Lyme disease)
2. Prevention of antibiotic-associated diarrhoea (AAD)
3. Supporting gut health during prolonged antibiotic therapy

• Doxycycline: Administered orally in tablet or capsule form, with typical doses ranging from 100 mg to 200 mg per day for 7-14 days. 
• Lactobacillus: Available in capsules or tablets, usually taken once or twice daily. The recommended dose ranges from 1 to 10 billion CFU per day.

• Common side effects include nausea, vomiting, and diarrhoea. Serious reactions include liver damage and kidney dysfunction.
• Rare side effects, such as bloating or gas, may occur.

• It should not be used during pregnancy, particularly in the second and third trimesters. Caution is needed in individuals with liver or kidney conditions.
• Generally safe but immunocompromised individuals should consult a healthcare provider before use.

• Avoid taking antacids, calcium, or iron supplements as they may interfere with absorption. Doxycycline increases sun sensitivity, so patients should avoid prolonged sun exposure.
• Generally safe but should be used cautiously in individuals with compromised immune systems

Complete the full course of doxycycline, lactobacillus as prescribed, even if symptoms improve early, to avoid antibiotic resistance. 

1. Milanova A, Pavlova I, Yordanova V, Danova S. Effect of doxycycline and Lactobacillus probiotics on mRNA expression of ABCC2 in small intestines of chickens. Iran J Vet Res. https://pmc.ncbi.nlm.nih.gov/articles/PMC5309459/
2. https://www.drugs.com/history/acticlate.html

This information is for educational purposes only. Always consult a healthcare provider before starting any new medication or supplement. Individual responses may vary.