My father's age is 80 and sodium levels are low at 129 but for the last 15 days, his BP is hovering around 165/99. He is taking Eritel 40 for the last 5 years and his BP remained normal at 130/78. Should he start taking 2 nos Eritel 40 or Twintel 10/40 (1 or 2)? Thanks.

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