Pharmacy is a unique degree in the fact it can be described as the "jack of all trades, master of none". That is its a very broad scientific degree, with chemistry, physics and maths, biology being integral components, but no-one being more important than the other. Chemistry is important for understanding how drugs are made, physics and maths important for how drugs are discovered and how they are formulated. Biology as a foundation of phyisology and pharmacology.
In addition to the core sciences, there is an emphasise on business and communication skills. The law and sociology relating to pharmacy and the practice itself.
I wouldn't be put off because you haven't studied biology, as the course is structured to account for students who might not of studied 3 sciences at A-Level. Your critical thinking AS will probably help you a great deal for the less scientific aspects of the course and for completing coursework.
Pharmacy offers excellent career prospects with graduates becoming practicing pharmacists in community, hospital, industry, academia, but because of the broad scientific background a pharmacy graduate is an attractive employee to the larger graduate recruitment companies including the accountancy firms, banks and chemical industries. Many pharmacy graduates have entered into law, in particular business law and some are involved in politics.
Hope this will have given you more insight into what you want to study.
Rich