“My forklift driver has started taking hay fever tablets. Is that a problem?”
It’s a fair question, and the honest answer is: it depends on the tablets, and possibly on the hay fever itself. For most office roles, seasonal allergies are a comfort issue. Anyone who drives for work, operates machinery, or holds a safety-critical role deserves a closer look, and it’s a conversation that tends not to happen until something prompts it.
Not All Antihistamines Are Equal
Antihistamines fall broadly into two groups.
Older, first-generation antihistamines commonly cause drowsiness. They can slow reaction times and impair concentration in ways people don’t always notice in themselves, and the effects can carry over into the next morning if taken at night.
Newer, second-generation antihistamines are designed not to cause drowsiness and are the sensible default for anyone in a safety-critical role. Although sold as non-drowsy, some do cause drowsiness in a minority of people, so it’s worth an individual paying attention the first few times they take it.
The practical problem is that many people don’t know which group their tablets belong to. They grab whatever is on the shelf, or use what’s always been in the medicine cabinet at home.
Untreated Hay Fever Isn’t the Safe Option Either
The instinct might be to say “just don’t take anything before a shift”, but that misses half the picture. Severe hay fever itself impairs performance: streaming eyes, repeated sneezing (during which a driver at motorway speed is effectively travelling blind), poor concentration, and the cumulative fatigue of disrupted sleep during high-pollen weeks.
So the goal isn’t avoiding medication. It’s about making sure people in safety-critical roles treat their symptoms with the right medication and know to flag them if their symptoms or side effects are getting on top of them.
The Legal Angle
Two points worth every employer knowing.
First, driving while impaired by drugs is an offence under the Road Traffic Act, and that includes legal, over-the-counter medicines. A delivery driver drowsy on sedating antihistamines is a road risk and a legal risk, for them and potentially for you.
Second, your general duties under health and safety law already cover this. If a risk assessment identifies safety-critical tasks, then medication that could impair performance belongs in that assessment, just as fatigue or alcohol does. Most medication and substance policies mention prescription drugs; plenty forget that over-the-counter medicines can have the same effects.
What Sensible Employers Do
None of this needs heavy machinery. In practice, it comes down to a few habits:
Make it easy to declare. Staff in safety-critical roles should know who to tell if they’re starting a new medication, and feel safe doing so. If declaring a hay fever tablet feels like inviting trouble, people simply won’t.
Say something before pollen season, not after an incident. A short, practical reminder in early spring: if your role involves driving or machinery, choose a non-drowsy antihistamine, and speak up if symptoms or side effects are affecting you.
Check your policy covers over-the-counter medicines, not just prescription and illicit drugs.
Ask for occupational health advice on the genuinely tricky cases. Most resolve with a simple switch of medication. Occasionally, someone’s symptoms are severe enough, or their treatment complicated enough, that a proper fitness-for-work assessment is the right call, particularly where safety-critical medicals already apply to the role.
Where We Fit
We assess fitness for safety-critical work every week, including driver medicals and Fork Lift Truck (FLT) medicals, and questions about medication come up all the time. If you’re unsure how hay fever season affects your drivers or operators, or you’d like a second opinion on a specific case, we’re happy to talk it through. Call us on 023 8047 5000 or email support@occupationalhealthltd.co.uk.
