ACLOV 400MG

# Acyclovir 400 mg ## SHORT DESCRIPTION Acyclovir 400 mg is an **antiviral medicine** used to treat infections caused by herpes viruses. It is commonly prescribed for **genital herpes, herpes simplex infections, and shingles (herpes zoster)**, depending on the patient's condition and treatment regimen. It may also be used to help prevent recurrent herpes infections in people who are at risk of frequent outbreaks. Acyclovir does **not eliminate herpes viruses from the body**, but it can reduce viral multiplication, shorten the duration and severity of outbreaks, and help reduce the frequency of recurrences when used as prescribed. ## KEY BENEFITS * Helps treat herpes simplex virus (HSV) infections * May reduce the duration and severity of herpes outbreaks * Helps reduce pain and discomfort associated with some herpes infections * Can help reduce the frequency of recurrent genital herpes when used as suppressive therapy * Used for the treatment of shingles caused by varicella-zoster virus * Works by inhibiting herpes virus replication * Can be used in selected patients for prevention of recurrent herpes infections ## USES / INDICATIONS Acyclovir 400 mg may be prescribed for: * **Genital herpes (HSV-2 and sometimes HSV-1)** * **Recurrent herpes simplex infections** * **Herpes simplex infections of the skin and mucous membranes** * **Shingles (herpes zoster)** * Prevention of recurrent herpes simplex infections in people with frequent outbreaks * Prevention of herpes simplex infections in certain patients with weakened immune systems The exact indication and dose depend on the type of infection, immune status, kidney function, age, and treatment history. ## HOW IT WORKS Acyclovir is a **nucleoside analogue antiviral**. After entering cells infected with herpes virus, it is converted into its active form, acyclovir triphosphate. The active drug inhibits the viral **DNA polymerase** enzyme and interferes with viral DNA synthesis. This prevents the virus from multiplying effectively and helps control the infection. Acyclovir works primarily in virus-infected cells and has relatively little effect on normal, uninfected cells. ## DOSAGE & ADMINISTRATION The dose of acyclovir depends on the infection being treated. ### Common adult dosing examples * **Initial genital herpes:** commonly 400 mg three times daily for approximately 7–10 days, depending on clinical circumstances and prescribing guidance. * **Recurrent genital herpes:** regimens may include 400 mg twice daily for 5 days or other short-course schedules. * **Suppressive therapy for recurrent genital herpes:** 400 mg twice daily is a commonly used regimen. * **Herpes zoster (shingles):** a higher total daily dose is generally required, commonly **800 mg five times daily for 7 days** in adults with normal kidney function. These are examples of commonly used regimens and **not a personalized prescription**. The appropriate regimen should be determined by a doctor. ### How to take Acyclovir 400 mg * Take exactly as prescribed. * Swallow the tablet with water. * It can generally be taken with or without food. * Maintain adequate fluid intake while taking acyclovir unless your doctor has advised you to restrict fluids. * Start treatment as early as possible after symptoms or an outbreak appear when prescribed for an acute infection. * Complete the prescribed course even if symptoms improve. * Do not double the dose if a dose is missed. Take it when remembered unless it is nearly time for the next dose. **Kidney impairment:** Dose adjustment may be necessary in patients with reduced kidney function. ## SIDE EFFECTS Common side effects may include: * Headache * Nausea * Vomiting * Diarrhea * Abdominal discomfort * Dizziness * Tiredness or fatigue * Skin rash Less common but serious effects may include: * Kidney problems * Confusion or hallucinations * Tremors * Seizures * Severe allergic reactions * Severe skin reactions The risk of neurological or kidney-related adverse effects may be higher in elderly patients or people with impaired kidney function, particularly when doses are not appropriately adjusted. Seek immediate medical attention for difficulty breathing, swelling of the face or throat, severe rash, confusion, seizures, or significantly reduced urine output. ## PRECAUTIONS & WARNINGS * Tell your doctor if you have **kidney disease** or a history of kidney problems. * Adequate hydration is important, particularly during treatment with oral acyclovir. * Older adults may require additional monitoring or dose adjustment. * Tell your doctor about all medicines you take before starting acyclovir. * Do not use acyclovir if you have a known serious allergy to acyclovir, valacyclovir, or any ingredient in the formulation. * Acyclovir does not cure herpes infections or permanently remove the virus from the body. * For genital herpes, avoid sexual contact during active lesions or symptoms because transmission can occur despite antiviral treatment. * Acyclovir does not protect against sexually transmitted infections other than reducing herpes virus activity when appropriately used. * People with weakened immune systems may require specialized treatment and monitoring. * Consult a healthcare professional before using acyclovir during pregnancy or breastfeeding. ## DRUG INTERACTIONS Acyclovir may interact with medicines that affect kidney function or its elimination from the body. Important medicines to discuss with your doctor include: * **Probenecid**, which can increase acyclovir exposure * **Mycophenolate mofetil**, which may increase exposure to acyclovir * Other medicines that may affect **kidney function** * Other potentially nephrotoxic medicines, particularly in patients with impaired kidney function Always inform your doctor or pharmacist about prescription medicines, OTC medicines, vitamins, and herbal supplements you are taking. ## STORAGE INFORMATION * Store at room temperature according to the manufacturer's instructions. * Keep the tablets in their original packaging. * Protect from excessive heat, moisture, and direct sunlight. * Keep out of reach of children and pets. * Do not use after the expiry date. * Do not use tablets if the packaging is damaged or the tablets appear deteriorated. ## PRESCRIPTION STATUS **Acyclovir 400 mg is generally a prescription medicine.** It should be used under the supervision of a healthcare professional because the appropriate dose depends on the type of herpes infection, kidney function, age, immune status, and treatment purpose. Prescription and dispensing requirements may vary between countries, including Nepal. ## GENUINE MEDICINE ASSURANCE For safe and genuine Acyclovir 400 mg: * Purchase only from a licensed and reputable pharmacy. * Check the product name and strength before use. * Verify the manufacturer, batch number, manufacturing information, and expiry date. * Ensure the packaging and seal are intact. * Avoid medicines with damaged, altered, or suspicious packaging. * Store the medicine according to the manufacturer's instructions. * If you have concerns about authenticity, consult a qualified pharmacist or healthcare professional. ## FAQ – FREQUENTLY ASKED QUESTIONS ### 1. What is Acyclovir 400 mg used for? Acyclovir 400 mg is an antiviral medicine used to treat and prevent certain infections caused by herpes viruses, including genital herpes and herpes simplex infections. Acyclovir is also used for shingles, although higher doses are generally required for herpes zoster. ### 2. Is Acyclovir 400 mg an antibiotic? No. Acyclovir is an **antiviral medicine**, not an antibiotic. It works against certain viruses and does not treat bacterial infections. ### 3. How does Acyclovir 400 mg work? Acyclovir is converted into an active form inside virus-infected cells and inhibits viral DNA polymerase. This interferes with herpes virus DNA production and reduces viral replication. ### 4. Does Acyclovir cure herpes permanently? No. Acyclovir controls herpes virus replication and can reduce symptoms and outbreaks, but it does not remove the herpes virus from the body. ### 5. How long does Acyclovir 400 mg take to work? Acyclovir begins acting against viral replication after it is absorbed, but improvement in symptoms may take several days. Starting treatment early during an outbreak can be beneficial. ### 6. Can Acyclovir 400 mg treat genital herpes? Yes. Acyclovir is commonly used for initial and recurrent genital herpes and may also be prescribed as suppressive therapy for people with frequent recurrences. ### 7. Can Acyclovir 400 mg be used for shingles? Yes. Acyclovir is used to treat shingles caused by varicella-zoster virus. Treatment is most effective when started as early as possible after the rash begins. The dose used for shingles is usually higher than 400 mg per dose. ### 8. Can I take Acyclovir 400 mg with food? Yes. Oral acyclovir can generally be taken with or without food. Taking it with food may be helpful if it causes stomach discomfort. ### 9. Should I drink plenty of water while taking Acyclovir? Maintaining adequate hydration is generally recommended, particularly because acyclovir can affect the kidneys in susceptible individuals. Patients with fluid restrictions should follow their doctor's specific advice. ### 10. Can Acyclovir cause kidney problems? Kidney problems are possible, particularly in people with pre-existing kidney disease, dehydration, older adults, or those receiving inappropriate doses. Your doctor may adjust the dose according to kidney function. ### 11. Can I stop Acyclovir when my symptoms improve? Do not stop a prescribed course early unless your doctor tells you to do so. For suppressive therapy, the duration should also be determined by your healthcare professional. ### 12. Can Acyclovir prevent herpes outbreaks? Yes. Acyclovir can be used as **suppressive therapy** to reduce the frequency of recurrent genital herpes outbreaks in people who experience frequent recurrences. ### 13. Does Acyclovir prevent herpes transmission? Acyclovir can reduce viral activity and outbreaks, but it does not completely eliminate the risk of transmitting herpes. Avoid sexual contact during active outbreaks and discuss transmission-reduction strategies with your healthcare professional. ### 14. Can Acyclovir be taken during pregnancy? Acyclovir may be used during pregnancy when the potential benefits outweigh the risks, but it should be taken only after consultation with a healthcare professional. ### 15. Is Acyclovir 400 mg available without a prescription? Acyclovir 400 mg is generally a prescription medicine, although regulations may vary by country. Obtain it through a licensed pharmacy and use it according to medical advice. ## MEDICAL DISCLAIMER This information is provided for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Acyclovir 400 mg should be used only as directed by a qualified healthcare professional. Dosage varies according to the type of infection, kidney function, age, immune status, and treatment purpose. Do not self-medicate or change the prescribed dose without medical advice. Seek medical attention for severe allergic reactions, confusion, seizures, significant reduction in urination, or other serious symptoms.