A pharmacist has warned that making a huge error when taking hay fever medication can be costly. Seema Khatri urged people to avoid making a pretty major mistake over the next few months
Katie-Ann Gupwell Content Editor
18:19, 04 May 2026
There’s an error hay fever sufferers should avoid making (stock image)(Image: Olga Pankova via Getty Images)
Millions of people across the country struggle with hay fever, and there are simple steps you can take to ease your symptoms effectively.
However, what you may not realise is that taking your medication incorrectly can have a significant impact, potentially leaving you feeling absolutely wretched.
Timing is everything, and there are a few key things you need to get to grips with to ensure you’re taking your medication in the most beneficial way possible. If you’ve been reaching for your hay fever tablets only once the sneezing kicks in, you’re already too late, according to pharmacist Seema Khatri at Roseway Labs.
This isn’t the first piece of expert guidance of this nature to surface recently, either. It was also noted that there are simple ways to exercise without worsening symptoms.
“Antihistamines work best when taken preventatively, not reactively,” said Seema. “Many people assume one pill gives instant relief, but the reality is, timing and technique really matter.”
For those who are out and about during the day, taking your medication in the morning gives it sufficient time to take effect before pollen levels peak, which typically occurs between late morning and midday. Non-drowsy options such as loratadine or cetirizine generally take between 30 to 60 minutes to begin working, with their effects lasting a full 24 hours.
Sneezing, itchy eyes or congestion at night can be triggered by indoor allergens such as dust mites or pollen drifting in through open windows. If this sounds familiar, taking an antihistamine at bedtime – particularly a mildly sedating variety like chlorphenamine – can prevent symptoms from interfering with your sleep.
Taking hay fever medication at the wrong time can mean symptoms are not properly controlled, resulting in higher symptom levels throughout the day and potentially leaving you feeling considerably worse.
She added: “Food can delay absorption. Unless your medicine says otherwise, take it with water at least an hour before or two hours after food for faster relief.”
Many people only reach for antihistamines when symptoms flare up, but by that point, your histamine response is already well underway. Taking them daily throughout allergy season helps maintain consistent levels, blocking histamine before it can cause problems.
Reactions such as bloating, rashes or itching may actually be down to excipients – the inactive fillers, binders or dyes used in tablets – rather than the active ingredient itself.
“Sometimes people assume they’re reacting to the medicine, when they’re actually reacting to additives,” Seema said. “A compounding pharmacy can create antihistamines without lactose, dyes or other triggers.”
Persistent or worsening allergies could indicate an overactive immune system, triggered by stress, poor sleep, gut problems or inflammation. Be on the lookout for fatigue, brain fog, skin flare-ups or food sensitivities, and consult your pharmacist or GP to get to the bottom of the underlying cause.
Seema continued: “The immune system is complex, and if it’s overreactive, antihistamines can only do so much. Understanding why your body is reacting more than usual is the key.”
How to identify the root cause
Begin by keeping a diary of your symptoms and lifestyle habits. Log your sleep patterns, diet, stress levels, and any other recurring issues, such as bloating, skin rashes, or low energy. This can help identify patterns or triggers that go beyond simply being exposed to pollen.
Functional tests, such as gut health panels, nutrient screenings or hormonal assessments, may also prove useful in determining whether deeper imbalances are contributing to histamine sensitivity. Consult a medical professional to establish what may be relevant to your particular situation.
Seema noted: “You don’t have to just put up with seasonal symptoms. When we look beyond the surface, we often find answers that make a real difference.”
If you’re struggling with hay fever or any other health concerns, reach out to your GP. This is always the best port of call for professional medical advice.
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