The diagnosis of allergies or adverse reactions to a medication like Malegra 200 (which contains sildenafil citrate, used for treating erectile dysfunction) should be carried out by a healthcare professional. If an allergic reaction is suspected, a referral to an allergist or immunologist might be necessary. These specialists can conduct specific tests to determine if there is an allergy to sildenafil or other components in Malegra 200. An allergist may perform skin tests or blood tests to determine if you have an allergy to sildenafil citrate or any other component in Malegra 200. If an allergy or adverse reaction is confirmed, the medication will typically be discontinued.