This invention relates to tetrahydro-naphthalene derivatives and salts thereof which are useful as active ingredients of pharmaceutical preparations. They have the general formula (I) in which R1 represents hydrogen or C1-6 alkyl, and X represents —N(H)Y1, —N(H)—C1-6 alkylene Y1, biphenyl or C1-6 alkyl substituted by biphenyl, and the group Y1 is an optionally substituted biphenyl. The tetrahydro-naphthalene derivatives of the present invention have excellent activity as VR1 antagonists and are useful for the prophylaxis and treatment of diseases associated with VR1 activity, in particular for the treatment of urinary incontinence, overactive bladder, urge urinary incontinence, chronic pain, neuropathic pain, postoperative pain, rheumatoid arthritic pain, neuralgia, neuropathies, algesia, nerve injury, ischaemia, neurodegeneration, stroke, inflammatory disorders, asthma and COPD.