Hi hun I take revlar Max strength and to me it has been my saviour it really turned my breathing around, I have not had any side effects, but everyone is different. I would persevere and observe at first as your headache could be from anything else really, but if you notice it continues or you have any worries speak to your g.p. We all react differently and what might work for one person may not work for another. Fingers crossed for you, god bless xx
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