cidofovir vs famotidine
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Side-by-side comparison of cidofovir and famotidine. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
Drug Interactions Probenecid Probenecid is known to interact with the metabolism or renal tubular excretion of many drugs (e.g., acetaminophen, acyclovir, angiotensin-converting enzyme inhibitors, aminosalicylic acid, barbiturates, benzodiazepines, bumetanide, clofibrate, methotrexate, famotidine, furosemide, nonsteroidal anti-inflammatory agents, theophylline, and zidovudine).
Vistide
Pepcid
Cidofovir injection is an antiviral medicine. It is used to treat CMV retinitis, an eye infection, in people with AIDS.
Famotidine (Pepcid) reduces stomach acid. It is used to treat ulcers, heartburn, and acid reflux.
Cidofovir treats CMV retinitis in people who have AIDS. CMV retinitis is an infection in the eye that can cause vision problems. This medicine has not been proven to work for other CMV infections or in people without HIV.
This medicine treats active duodenal ulcers and active gastric ulcers. It also treats heartburn (nonerosive GERD) and erosive esophagitis (damage to the esophagus from acid reflux). Famotidine can also treat conditions where the stomach makes too much acid, like Zollinger-Ellison syndrome. It can also lower the risk of duodenal ulcers coming back.
Cidofovir stops the CMV virus from making copies of itself. It does this by blocking a key enzyme the virus needs to reproduce its DNA. This helps to reduce the amount of virus in your body.
Famotidine is an H2 receptor antagonist. This means it blocks histamine, a substance that tells your stomach to make acid. By blocking histamine, famotidine reduces the amount of acid your stomach produces.
- • Kidney problems
- • Lowered white blood cell count
- • Decreased eye pressure
- • Inflammation inside the eye
- • Headache
- • Dizziness
- • Constipation
- • Diarrhea
No adverse event reports.
- Nausea 7,258
- Fatigue 6,866
- Chronic Kidney Disease 6,644
- Diarrhoea 6,452
- Dyspnoea 5,202
Cidofovir can cause serious kidney damage, possibly leading to death. To reduce this risk, you must receive IV fluids and take probenecid pills with each dose. Your kidney function and white blood cell counts will be checked regularly. This drug can also cause birth defects and cancer, based on animal studies. It is only for treating CMV retinitis in AIDS patients.
In elderly patients and those with kidney problems, famotidine can cause confusion, delirium, or hallucinations. If you are elderly or have kidney problems, your doctor may prescribe a lower dose. Famotidine can hide the symptoms of stomach cancer. If your symptoms don't improve, tell your doctor.
Cidofovir may cause harm to an unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is not known if cidofovir passes into breast milk, so talk to your doctor if you are breastfeeding.
It is not known if famotidine will harm an unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. Famotidine may pass into breast milk, but it's not expected to harm the baby. Talk to your doctor about breastfeeding while taking this medicine.
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How to Read This cidofovir vs famotidine Comparison
cidofovir is classified in the Antiviral (Nucleotide Analog) drug class, while famotidine sits within the H2 Receptor Antagonist class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are split between OTC and prescription status, which affects access and supervision.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, cidofovir has 0 submissions while famotidine has 32,422. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to probenecid is used with cidofovir and can change how your kidneys get rid of famotidine. this might cause famotidine to stay in your body longer than usual.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot represent individual circumstances. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This registry does not provide medical, treatment, substitution, or medication-change directions for cidofovir or famotidine.
Registry boundary: This comparison displays source-record fields and does not provide individualized medical direction.