NutriStack
Alcohol and Loratadine, a caution.
Loratadine is much less sedating than older antihistamines, and controlled testing did not find meaningful driving or psychomotor impairment from a standard 10 mg dose, even when alcohol was included in the study design. Alcohol itself still impaired performance in that trial, and some people can feel drowsy on loratadine. The practical risk is highest before driving, in older adults, with higher-than-labeled loratadine doses, or when other sedatives are also present.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Alcohol and Loratadine
- Pair type
- Caution
- Evidence (highest tier)
- Moderate
- Source citations
- 2 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Moderate evidence
Caution
What is happening. Loratadine is much less sedating than older antihistamines, and controlled testing did not find meaningful driving or psychomotor impairment from a standard 10 mg dose, even when alcohol was included in the study design. Alcohol itself still impaired performance in that trial, and some people can feel drowsy on loratadine. The practical risk is highest before driving, in older adults, with higher-than-labeled loratadine doses, or when other sedatives are also present.
Mechanism. Loratadine has limited penetration into the central nervous system compared with first-generation H1 antihistamines, so it usually does not add much CNS depression. Alcohol independently impairs attention, coordination, judgment, and reaction time through CNS depressant effects.
Recommendation. Use extra caution with alcohol until you know how loratadine affects you. Do not drive, operate machinery, or do safety-sensitive work after drinking, even if loratadine is not making you sleepy. Avoid adding cannabis, sleep aids, or other sedating products on the same day.
Sources (2)
- Ramaekers JG, Uiterwijk MM, O'Hanlon JF. Effects of loratadine and cetirizine on actual driving and psychometric test performance, and EEG during driving. Eur J Clin Pharmacol. 1992;42(4):363-369. PMID 1355427
- Roman IJ, Danzig MR. Loratadine. A review of recent findings in pharmacology, pharmacokinetics, efficacy, and safety, with a look at its use in combination with pseudoephedrine. Clin Rev Allergy. 1993;11(1):89-110. PMID 8319163
Stack Score
How this pair moves the number.
Effect on the composite score
If both Alcohol and Loratadine are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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