Allergic Reaction
An allergic reaction happens when the immune system mounts a response to something it has mistakenly flagged as a threat, pollen, food, insect stings, latex, or a medicine. In tropical climates, high humidity and year-round plant pollination mean exposure to triggers is constant rather than seasonal, making reactions a common reason people seek care.
Key points
- Reactions triggered by food or insect venom can extend beyond the skin, swelling the lips, tongue or throat.
- Anaphylaxis comes on fast and can involve laboured breathing, collapsing blood pressure, or unconsciousness, so it needs emergency care.
- When inflammation is more widespread, a brief steroid course can be used once antihistamines alone are not enough.
What an allergic reaction looks and feels like
Mild-to-moderate reactions typically involve itching, hives (raised, red welts on the skin), sneezing, watery eyes, or a runny nose. Reactions to food or insect venom can also cause swelling of the lips, tongue, or throat. More severe reactions, known as anaphylaxis, come on quickly and may include difficulty breathing, a sudden drop in blood pressure, or loss of consciousness. Anaphylaxis is a medical emergency: go to the nearest emergency department immediately.
How allergic reactions are treated
For mild reactions, antihistamines settle itching and hives quickly. When inflammation is more significant, widespread rash, facial swelling, or persistent symptoms, a short course of a corticosteroid such as prednisolone helps calm the immune response. Severe or recurrent reactions sometimes call for a broader management plan that may touch on pain management if the reaction causes significant discomfort.
Further reading
What is an allergic reaction?
An allergic reaction happens when the immune system mounts a response to something it has mistakenly flagged as a threat. Triggers can include pollen, food, insect stings, latex, or a medicine.
What are the symptoms of an allergic reaction?
Mild-to-moderate reactions typically involve itching, hives, sneezing, watery eyes, or a runny nose. Reactions to food or insect venom can also cause swelling of the lips, tongue, or throat. More severe reactions, known as anaphylaxis, come on quickly and may include difficulty breathing, a sudden drop in blood pressure, or loss of consciousness.
How is an allergic reaction treated?
For mild reactions, antihistamines settle itching and hives quickly. When the reaction is more significant, with a widespread rash, facial swelling or persistent symptoms, a short course of a corticosteroid such as prednisolone helps calm the immune response.
When should I see a doctor for an allergic reaction?
If you have difficulty breathing, a sudden drop in blood pressure, or loss of consciousness, go to the nearest emergency department immediately. Severe or recurrent reactions may also need a broader management plan.
What medicines are available for allergic reactions?
The medicines listed for allergic reactions contain prednisolone. Examples include Orapred and Prelone. Each product page lists the strengths and forms.
Are medicines for allergic reactions available over the counter in Thailand?
Yes, online. Yasabai does not ask for a prescription to order medicines for allergic reactions. We are an online store, not a dispensing pharmacy; we arrange your order and delivery on your behalf.
Ordering without a prescription →Do you deliver medicines for allergic reactions to Thailand?
Yes. Our pharmacy partners ship from India to Thailand and across Asia in discreet packaging. Standard Airmail takes up to 3 weeks; Express Tracked Courier takes up to 1 week.
How ordering works →