I am on Effexor for anxiety and depression. One of the major side effects is a loss of libido and difficulty in orgasm. Is there any alternative remedy that you can suggest?

Effexor affects both serotonin, the brain's mood booster, and noradrenalin, its 'motivator'. The natural alternative is to supplement the amino acids that the brain uses to build these neurotransmitters. For serotonin this means supplementing tryptophan, the most effective form of which is 5-HTP, 100mg a day. For noradrenalin, the key amino acid is tyrosine. You need 2,000mg a day. These supplements can be bought in any healthfood store. The Brain Bio Centre (020-8871 9261 or visit mentalhealthproject.com) offers a brain 'MOT', which works out the specific nutrients you need. Omega-3 fish oil capsules, as well as B vitamins, are often recommended to combat depression.

I am male, aged 65, and suffer from postnasal drip (catarrh). Allergy tests and a CT scan have revealed nothing sinister, and treatment with tetracycline has not been effective. Do you have any advice?

A naturopath would help establish the cause of your chronic catarrh, which could be the result of an allergy, or other factors such as central heating, drugs or damp — contact the General Council and Register of Naturopaths (01458 840072; naturopathy.org.uk) for a local practitioner. Inhalations of eucalyptus, thyme and tea tree essential oils loosen mucous and kill bacteria. Fresh ginger tea, plenty of water, garlic and horseradish can help. Also try muccolyte, by BioCare (0121-433 3727): it contains zinc, iron, vitamins A and C, and bioflavonoids, and is designed to combat catarrh.

· Emma Mitchell is a natural health therapist. Before following Emma's recommendations, you should consult your GP about any medical problems or special health conditions.

Send your questions to Wellbeing, Guardian Weekend, 119 Farringdon Road, London EC1R 3ER. Email: ask.emma@theguardian.com