The authors agree

A non-steroidal anti-inflammatory drug,(NSAID) such as Naproxen 500mg bd or Ibuprofen 400 mg tds is considered to be the initial treatment of choice for bony metastases.

Since you suspect bony metastases, it is worth prescribing an NSAID while waiting for the bone scan result, providing there are no contraindications. (eg history of peptic ulcer).

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