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Grass pollen allergen extract is a standardised diagnostic preparation used during skin-prick testing. It helps identify sensitisation associated with specific IgE-mediated grass pollen allergy; it does not treat or desensitise the allergy.
Griseofulvin is a prescription antifungal taken by mouth. It treats dermatophyte infections of the skin, scalp, hair or nails when topical treatment is unsuitable or has not worked.
Guaifenesin is an expectorant for chesty or productive coughs. It helps make mucus easier to clear by coughing but does not treat the cause of the cough.
This oral cough syrup combines an expectorant with levomenthol. Guaifenesin loosens and thins bronchial secretions so they are easier to cough up, while levomenthol provides a cooling sensation and may ease congestion.
This combination treats several cold and flu symptoms at once. Paracetamol relieves pain and fever, phenylephrine reduces nasal congestion, and guaifenesin loosens mucus in a chesty cough.
This combination contains an expectorant and an oral decongestant. It temporarily relieves a mucus-producing cough with blocked nasal or sinus passages.
Guanfacine hydrochloride is a non-stimulant ADHD treatment. In the UK, prolonged-release guanfacine is licensed for children and adolescents aged 6–17 years when stimulants are unsuitable, not tolerated or ineffective, as part of wider ADHD care.
Guselkumab is a biologic monoclonal antibody that blocks interleukin-23, a protein involved in inflammation. Selected UK products are licensed for adults with plaque psoriasis, psoriatic arthritis, Crohn’s disease or ulcerative colitis when relevant criteria are met.