cetirizine vs efavirenz/emtricitabine/tenofovir
PlainMeds reviewed this comparison against our methodology in August 2026. It places FDA and CMS record fields side by side, without recommending either medication.
Side-by-side comparison of cetirizine and efavirenz/emtricitabine/tenofovir. 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
7.5 Drugs Without Clinically Significant Interactions with Efavirenz No dosage adjustment is recommended when efavirenz is given with the following: aluminum/magnesium hydroxide antacids, azithromycin, cetirizine, famotidine, fluconazole, lorazepam, nelfinavir, nucleoside reverse transcriptase inhibitors (abacavir, emtricitabine, lamivudine, stavudine, tenofovir disoproxil fumarate, zidovudine), paroxetine, and raltegravir.
Zyrtec
Cetirizine (Zyrtec) is an antihistamine medicine. It helps relieve allergy symptoms.
Efavirenz is a drug used to treat HIV-1 infection. It belongs to a class of drugs called non-nucleoside reverse transcriptase inhibitors (NNRTI).
This medicine treats allergy symptoms. It can help with a runny nose, sneezing, and itchy, watery eyes. It also helps with itching of the nose or throat caused by hay fever or other upper respiratory allergies.
Efavirenz is used to treat HIV-1, the virus that causes AIDS. It helps to lower the amount of virus in your body. This medicine must be used with other HIV medicines.
Cetirizine blocks histamine in your body. Histamine is a natural substance that causes allergy symptoms. By blocking it, cetirizine reduces these symptoms.
Efavirenz blocks an enzyme called reverse transcriptase. HIV needs this enzyme to make copies of itself. By blocking it, efavirenz helps to slow down the spread of HIV in your body.
- • Headache
- • Fatigue
- • Rash
- • Dizziness
- • Nausea
- • Headache
- • Fatigue
- Fatigue 12,861
- Pain 12,124
- Rash 9,771
- Abdominal Discomfort 9,317
- Alopecia 9,237
- Virologic Failure 952
- Drug Interaction 748
- Drug Resistance 735
- Viral Mutation Identified 674
- Pathogen Resistance 623
Ask a doctor before use if you have liver or kidney disease. Children under 2 years of age should ask a doctor before use.
Efavirenz can cause serious side effects, including psychiatric problems like depression or suicidal thoughts. Tell your doctor right away if you have any of these symptoms. Efavirenz can also harm your liver. Your doctor should check your liver function before and during treatment. Do not take efavirenz by itself.
Ask a doctor if you are pregnant or breastfeeding before taking this medicine. It is not known if cetirizine will harm your unborn baby or pass into breast milk.
Efavirenz can harm your unborn baby, especially during the first 3 months of pregnancy. Talk to your doctor about using birth control while taking this medicine. Breastfeeding is not recommended while taking efavirenz.
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How to Read This cetirizine vs efavirenz/emtricitabine/tenofovir Comparison
cetirizine is classified in the Second-Generation Antihistamine drug class, while efavirenz/emtricitabine/tenofovir sits within the NNRTI / NRTI Combination 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, cetirizine has 53,310 submissions while efavirenz/emtricitabine/tenofovir has 3,732. 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 these drugs do not interfere with how the body processes each other.. 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 cetirizine or efavirenz/emtricitabine/tenofovir.
Registry boundary: This comparison displays source-record fields and does not provide individualized medical direction.